21102125 has 32 divisors (see below), whose sum is σ = 29203200. Its totient is φ = 15096000.

The previous prime is 21102113. The next prime is 21102161. The reversal of 21102125 is 52120112.

It is not a de Polignac number, because 21102125 - 2⁸ = 21101869 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 141551 + ... + 141699.

It is an arithmetic number, because the mean of its divisors is an integer number (912600).

Almost surely, 2^21102125 is an apocalyptic number.

21102125 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21102125 is a deficient number, since it is larger than the sum of its proper divisors (8101075).

21102125 is a wasteful number, since it uses less digits than its factorization.

21102125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 278 (or 268 counting only the distinct ones).

The product of its (nonzero) digits is 40, while the sum is 14.

The square root of 21102125 is about 4593.7049317517. The cubic root of 21102125 is about 276.3389249833.

Adding to 21102125 its reverse (52120112), we get a palindrome (73222237).

The spelling of 21102125 in words is "twenty-one million, one hundred two thousand, one hundred twenty-five".