21379036 has 24 divisors (see below), whose sum is σ = 43462496. Its totient is φ = 9011520.

The previous prime is 21379027. The next prime is 21379049. The reversal of 21379036 is 63097312.

It is a junction number, because it is equal to n+sod(n) for n = 21378989 and 21379007.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4551 + ... + 7966.

Almost surely, 2^21379036 is an apocalyptic number.

It is an amenable number.

21379036 is an abundant number, since it is smaller than the sum of its proper divisors (22083460).

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

21379036 is a wasteful number, since it uses less digits than its factorization.

21379036 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12589 (or 12587 counting only the distinct ones).

The product of its (nonzero) digits is 6804, while the sum is 31.

The square root of 21379036 is about 4623.7469653951. The cubic root of 21379036 is about 277.5424213480.

The spelling of 21379036 in words is "twenty-one million, three hundred seventy-nine thousand, thirty-six".