21438595996 has 12 divisors (see below), whose sum is σ = 37538526760. Its totient is φ = 10713302640.

The previous prime is 21438595993. The next prime is 21438596017. The reversal of 21438595996 is 69959583412.

It is a super-2 number, since 2×21438595996² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21438595993) 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, 1490790 + ... + 1505101.

Almost surely, 2^21438595996 is an apocalyptic number.

It is an amenable number.

21438595996 is a deficient number, since it is larger than the sum of its proper divisors (16099930764).

21438595996 is a wasteful number, since it uses less digits than its factorization.

21438595996 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997684 (or 2997682 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 61.

The spelling of 21438595996 in words is "twenty-one billion, four hundred thirty-eight million, five hundred ninety-five thousand, nine hundred ninety-six".