21057874452 has 48 divisors (see below), whose sum is σ = 54621530880. Its totient is φ = 7015814784.

The previous prime is 21057874447. The next prime is 21057874469. The reversal of 21057874452 is 25447875012.

21057874452 is a `hidden beast` number, since 2 + 1 + 0 + 578 + 74 + 4 + 5 + 2 = 666.

It is a super-3 number, since 3×21057874452³ (a number of 32 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21057874398 and 21057874407.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 175548 + ... + 270060.

It is an arithmetic number, because the mean of its divisors is an integer number (1137948560).

Almost surely, 2^21057874452 is an apocalyptic number.

It is an amenable number.

21057874452 is an abundant number, since it is smaller than the sum of its proper divisors (33563656428).

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

21057874452 is a wasteful number, since it uses less digits than its factorization.

21057874452 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96589 (or 96581 counting only the distinct ones).

The product of its (nonzero) digits is 627200, while the sum is 45.

The spelling of 21057874452 in words is "twenty-one billion, fifty-seven million, eight hundred seventy-four thousand, four hundred fifty-two".