21502362425 has 12 divisors (see below), whose sum is σ = 27038465856. Its totient is φ = 16959608400.

The previous prime is 21502362397. The next prime is 21502362449. The reversal of 21502362425 is 52426320512.

It is not a de Polignac number, because 21502362425 - 2²² = 21498168121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21502362391 and 21502362400.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6055229 + ... + 6058778.

It is an arithmetic number, because the mean of its divisors is an integer number (2253205488).

Almost surely, 2^21502362425 is an apocalyptic number.

21502362425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21502362425 is a deficient number, since it is larger than the sum of its proper divisors (5536103431).

21502362425 is a wasteful number, since it uses less digits than its factorization.

21502362425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12114088 (or 12114083 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 32.

Adding to 21502362425 its reverse (52426320512), we get a palindrome (73928682937).

The spelling of 21502362425 in words is "twenty-one billion, five hundred two million, three hundred sixty-two thousand, four hundred twenty-five".