21167407436 has 12 divisors (see below), whose sum is σ = 42334814928. Its totient is φ = 9071746032.

The previous prime is 21167407411. The next prime is 21167407439. The reversal of 21167407436 is 63470476112.

21167407436 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 21167407393 and 21167407402.

It is not an unprimeable number, because it can be changed into a prime (21167407439) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377989391 + ... + 377989446.

It is an arithmetic number, because the mean of its divisors is an integer number (3527901244).

Almost surely, 2^21167407436 is an apocalyptic number.

It is an amenable number.

21167407436 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21167407436 is a wasteful number, since it uses less digits than its factorization.

21167407436 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 755978848 (or 755978846 counting only the distinct ones).

The product of its (nonzero) digits is 169344, while the sum is 41.

The spelling of 21167407436 in words is "twenty-one billion, one hundred sixty-seven million, four hundred seven thousand, four hundred thirty-six".