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225225021 = 3721532143
BaseRepresentation
bin11010110110010…
…10100100111101
3120200210121122110
431123022210331
5430124200041
634203204233
75403244500
oct1533124475
9520717573
10225225021
1110615198a
1263516679
1337879a58
1421cab137
1514b8d516
hexd6ca93d

225225021 has 12 divisors (see below), whose sum is σ = 349328832. Its totient is φ = 128699928.

The previous prime is 225224983. The next prime is 225225029. The reversal of 225225021 is 120522522.

It is not a de Polignac number, because 225225021 - 210 = 225223997 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225225029) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 765925 + ... + 766218.

It is an arithmetic number, because the mean of its divisors is an integer number (29110736).

Almost surely, 2225225021 is an apocalyptic number.

225225021 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

225225021 is a deficient number, since it is larger than the sum of its proper divisors (124103811).

225225021 is a wasteful number, since it uses less digits than its factorization.

225225021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1532160 (or 1532153 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 21.

The square root of 225225021 is about 15007.4988255872. The cubic root of 225225021 is about 608.4228909912.

Adding to 225225021 its reverse (120522522), we get a palindrome (345747543).

The spelling of 225225021 in words is "two hundred twenty-five million, two hundred twenty-five thousand, twenty-one".

Divisors: 1 3 7 21 49 147 1532143 4596429 10725001 32175003 75075007 225225021