21302504425 has 12 divisors (see below), whose sum is σ = 26977130496. Its totient is φ = 16679406800.

The previous prime is 21302504401. The next prime is 21302504429. The reversal of 21302504425 is 52440520312.

It is not a de Polignac number, because 21302504425 - 2¹³ = 21302496233 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21302504393 and 21302504402.

It is not an unprimeable number, because it can be changed into a prime (21302504429) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9063721 + ... + 9066070.

It is an arithmetic number, because the mean of its divisors is an integer number (2248094208).

Almost surely, 2^21302504425 is an apocalyptic number.

21302504425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21302504425 is a deficient number, since it is larger than the sum of its proper divisors (5674626071).

21302504425 is a wasteful number, since it uses less digits than its factorization.

21302504425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18129848 (or 18129843 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 28.

The spelling of 21302504425 in words is "twenty-one billion, three hundred two million, five hundred four thousand, four hundred twenty-five".