21054534025 has 12 divisors (see below), whose sum is σ = 29837282752. Its totient is φ = 14437394640.

The previous prime is 21054534019. The next prime is 21054534047. The reversal of 21054534025 is 52043545012.

It is a de Polignac number, because none of the positive numbers 2^k-21054534025 is a prime.

It is a hoax number, since the sum of its digits (31) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

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, 60155637 + ... + 60155986.

Almost surely, 2^21054534025 is an apocalyptic number.

21054534025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

21054534025 is a deficient number, since it is larger than the sum of its proper divisors (8782748727).

21054534025 is a wasteful number, since it uses less digits than its factorization.

21054534025 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 120311640 (or 120311635 counting only the distinct ones).

The product of its (nonzero) digits is 24000, while the sum is 31.

The spelling of 21054534025 in words is "twenty-one billion, fifty-four million, five hundred thirty-four thousand, twenty-five".