21303711225 has 36 divisors (see below), whose sum is σ = 38167723776. Its totient is φ = 11358879840.

The previous prime is 21303711161. The next prime is 21303711227. The reversal of 21303711225 is 52211730312.

It is not a de Polignac number, because 21303711225 - 2⁶ = 21303711161 is a prime.

It is a super-2 number, since 2×21303711225² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21303711227) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 984472 + ... + 1005878.

Almost surely, 2^21303711225 is an apocalyptic number.

21303711225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21303711225 is a deficient number, since it is larger than the sum of its proper divisors (16864012551).

21303711225 is a wasteful number, since it uses less digits than its factorization.

21303711225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25846 (or 25838 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 27.

The spelling of 21303711225 in words is "twenty-one billion, three hundred three million, seven hundred eleven thousand, two hundred twenty-five".