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21025125 = 3253111699
BaseRepresentation
bin101000000110…
…1000101100101
31110120012001100
41100031011211
520340301000
62030350313
7343465512
oct120150545
943505040
1021025125
1110960540
12705b399
134481c04
142b14309
151ca4a00
hex140d165

21025125 has 48 divisors (see below), whose sum is σ = 41371200. Its totient is φ = 10188000.

The previous prime is 21025117. The next prime is 21025127. The reversal of 21025125 is 52152012.

It is not a de Polignac number, because 21025125 - 23 = 21025117 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21025098 and 21025107.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21025127) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11526 + ... + 13224.

It is an arithmetic number, because the mean of its divisors is an integer number (861900).

Almost surely, 221025125 is an apocalyptic number.

21025125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21025125 is a deficient number, since it is larger than the sum of its proper divisors (20346075).

21025125 is a wasteful number, since it uses less digits than its factorization.

21025125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1731 (or 1718 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 21025125 is about 4585.3162377310. The cubic root of 21025125 is about 276.0024023105.

Adding to 21025125 its reverse (52152012), we get a palindrome (73177137).

It can be divided in two parts, 210251 and 25, that added together give a triangular number (210276 = T648).

The spelling of 21025125 in words is "twenty-one million, twenty-five thousand, one hundred twenty-five".

Divisors: 1 3 5 9 11 15 25 33 45 55 75 99 125 165 225 275 375 495 825 1125 1375 1699 2475 4125 5097 8495 12375 15291 18689 25485 42475 56067 76455 93445 127425 168201 212375 280335 382275 467225 637125 841005 1401675 1911375 2336125 4205025 7008375 21025125