21158421432 has 64 divisors (see below), whose sum is σ = 56254195200. Its totient is φ = 6612710400.

The previous prime is 21158421409. The next prime is 21158421433. The reversal of 21158421432 is 23412485112.

It is a junction number, because it is equal to n+sod(n) for n = 21158421393 and 21158421402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21158421433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 194944 + ... + 283407.

It is an arithmetic number, because the mean of its divisors is an integer number (878971800).

Almost surely, 2^21158421432 is an apocalyptic number.

It is an amenable number.

21158421432 is an abundant number, since it is smaller than the sum of its proper divisors (35095773768).

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

21158421432 is a wasteful number, since it uses less digits than its factorization.

21158421432 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 478476 (or 478472 counting only the distinct ones).

The product of its digits is 15360, while the sum is 33.

The spelling of 21158421432 in words is "twenty-one billion, one hundred fifty-eight million, four hundred twenty-one thousand, four hundred thirty-two".