21425355170928 has 30 divisors (see below), whose sum is σ = 59961237041264. Its totient is φ = 7141785056928.

The previous prime is 21425355170917. The next prime is 21425355170957. The reversal of 21425355170928 is 82907155352412.

21425355170928 is a `hidden beast` number, since 2 + 1 + 4 + 2 + 5 + 35 + 517 + 0 + 92 + 8 = 666.

It is a super-2 number, since 2×21425355170928² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 74393594200 + ... + 74393594487.

Almost surely, 2^{21425355170928} is an apocalyptic number.

It is an amenable number.

21425355170928 is an abundant number, since it is smaller than the sum of its proper divisors (38535881870336).

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

21425355170928 is a wasteful number, since it uses less digits than its factorization.

21425355170928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148787188701 (or 148787188692 counting only the distinct ones).

The product of its (nonzero) digits is 6048000, while the sum is 54.

The spelling of 21425355170928 in words is "twenty-one trillion, four hundred twenty-five billion, three hundred fifty-five million, one hundred seventy thousand, nine hundred twenty-eight".