21036125 has 16 divisors (see below), whose sum is σ = 28641600. Its totient is φ = 15298000.

The previous prime is 21036083. The next prime is 21036131. The reversal of 21036125 is 52163012.

It is not a de Polignac number, because 21036125 - 2⁶ = 21036061 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a junction number, because it is equal to n+sod(n) for n = 21036097 and 21036106.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6275 + ... + 9024.

It is an arithmetic number, because the mean of its divisors is an integer number (1790100).

Almost surely, 2^21036125 is an apocalyptic number.

21036125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21036125 is a deficient number, since it is larger than the sum of its proper divisors (7605475).

21036125 is a wasteful number, since it uses less digits than its factorization.

21036125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15325 (or 15315 counting only the distinct ones).

The product of its (nonzero) digits is 360, while the sum is 20.

The square root of 21036125 is about 4586.5155619490. The cubic root of 21036125 is about 276.0505272264.

Adding to 21036125 its reverse (52163012), we get a palindrome (73199137).

It can be divided in two parts, 2103 and 6125, that added together give a palindrome (8228).

The spelling of 21036125 in words is "twenty-one million, thirty-six thousand, one hundred twenty-five".