21120113625 has 128 divisors (see below), whose sum is σ = 40634141184. Its totient is φ = 9649152000.

The previous prime is 21120113611. The next prime is 21120113639. The reversal of 21120113625 is 52631102112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (21120113611) and next prime (21120113639).

It is not a de Polignac number, because 21120113625 - 2¹¹ = 21120111577 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21120113595 and 21120113604.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 6048130 + ... + 6051620.

It is an arithmetic number, because the mean of its divisors is an integer number (317454228).

Almost surely, 2^21120113625 is an apocalyptic number.

21120113625 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21120113625 is a deficient number, since it is larger than the sum of its proper divisors (19514027559).

21120113625 is a wasteful number, since it uses less digits than its factorization.

21120113625 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3612 (or 3602 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 24.

Adding to 21120113625 its reverse (52631102112), we get a palindrome (73751215737).

The spelling of 21120113625 in words is "twenty-one billion, one hundred twenty million, one hundred thirteen thousand, six hundred twenty-five".