21725157400 has 24 divisors (see below), whose sum is σ = 50510991420. Its totient is φ = 8690062880.

The previous prime is 21725157373. The next prime is 21725157401. The reversal of 21725157400 is 475152712.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21725157401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54312694 + ... + 54313093.

Almost surely, 2^21725157400 is an apocalyptic number.

21725157400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21725157400 is an abundant number, since it is smaller than the sum of its proper divisors (28785834020).

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

21725157400 is a wasteful number, since it uses less digits than its factorization.

21725157400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108625803 (or 108625794 counting only the distinct ones).

The product of its (nonzero) digits is 19600, while the sum is 34.

The spelling of 21725157400 in words is "twenty-one billion, seven hundred twenty-five million, one hundred fifty-seven thousand, four hundred".