21379364396 has 24 divisors (see below), whose sum is σ = 41591620224. Its totient is φ = 9549095040.

The previous prime is 21379364387. The next prime is 21379364401. The reversal of 21379364396 is 69346397312.

It is a happy number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 6629705 + ... + 6632928.

It is an arithmetic number, because the mean of its divisors is an integer number (1732984176).

Almost surely, 2^21379364396 is an apocalyptic number.

21379364396 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21379364396 is a deficient number, since it is larger than the sum of its proper divisors (20212255828).

21379364396 is a wasteful number, since it uses less digits than its factorization.

21379364396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13262681 (or 13262679 counting only the distinct ones).

The product of its digits is 4408992, while the sum is 53.

The spelling of 21379364396 in words is "twenty-one billion, three hundred seventy-nine million, three hundred sixty-four thousand, three hundred ninety-six".