21051168432 has 80 divisors (see below), whose sum is σ = 62173520640. Its totient is φ = 6012446976.

The previous prime is 21051168409. The next prime is 21051168497. The reversal of 21051168432 is 23486115012.

It is a junction number, because it is equal to n+sod(n) for n = 21051168393 and 21051168402.

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, 1075243 + ... + 1094645.

It is an arithmetic number, because the mean of its divisors is an integer number (777169008).

Almost surely, 2^21051168432 is an apocalyptic number.

It is an amenable number.

21051168432 is an abundant number, since it is smaller than the sum of its proper divisors (41122352208).

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

21051168432 is a wasteful number, since it uses less digits than its factorization.

21051168432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22650 (or 22644 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 33.

The spelling of 21051168432 in words is "twenty-one billion, fifty-one million, one hundred sixty-eight thousand, four hundred thirty-two".