21113024525 has 24 divisors (see below), whose sum is σ = 26746442880. Its totient is φ = 16528861440.

The previous prime is 21113024521. The next prime is 21113024573. The reversal of 21113024525 is 52542031112.

It is not a de Polignac number, because 21113024525 - 2² = 21113024521 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21113024494 and 21113024503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21113024521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 175874 + ... + 270476.

It is an arithmetic number, because the mean of its divisors is an integer number (1114435120).

Almost surely, 2^21113024525 is an apocalyptic number.

21113024525 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21113024525 is a deficient number, since it is larger than the sum of its proper divisors (5633418355).

21113024525 is a wasteful number, since it uses less digits than its factorization.

21113024525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94805 (or 94800 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 21113024525 its reverse (52542031112), we get a palindrome (73655055637).

The spelling of 21113024525 in words is "twenty-one billion, one hundred thirteen million, twenty-four thousand, five hundred twenty-five".