21254725356 has 24 divisors (see below), whose sum is σ = 51304510320. Its totient is φ = 6840601152.

The previous prime is 21254725319. The next prime is 21254725357. The reversal of 21254725356 is 65352745212.

It is not an unprimeable number, because it can be changed into a prime (21254725357) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30538051 + ... + 30538746.

It is an arithmetic number, because the mean of its divisors is an integer number (2137687930).

Almost surely, 2^21254725356 is an apocalyptic number.

It is an amenable number.

21254725356 is an abundant number, since it is smaller than the sum of its proper divisors (30049784964).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21254725356 is a wasteful number, since it uses less digits than its factorization.

21254725356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61076833 (or 61076831 counting only the distinct ones).

The product of its digits is 504000, while the sum is 42.

The spelling of 21254725356 in words is "twenty-one billion, two hundred fifty-four million, seven hundred twenty-five thousand, three hundred fifty-six".