21819981996396 has 24 divisors (see below), whose sum is σ = 56570323694640. Its totient is φ = 7273327332096.

The previous prime is 21819981996289. The next prime is 21819981996403. The reversal of 21819981996396 is 69369918991812.

21819981996396 is a `hidden beast` number, since 21 + 8 + 19 + 9 + 8 + 199 + 6 + 396 = 666.

It is a super-2 number, since 2×21819981996396² (a number of 27 digits) contains 22 as substring.

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, 101018435061 + ... + 101018435276.

It is an arithmetic number, because the mean of its divisors is an integer number (2357096820610).

Almost surely, 2^{21819981996396} is an apocalyptic number.

It is an amenable number.

21819981996396 is an abundant number, since it is smaller than the sum of its proper divisors (34750341698244).

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

21819981996396 is a wasteful number, since it uses less digits than its factorization.

21819981996396 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 202036870350 (or 202036870342 counting only the distinct ones).

The product of its digits is 816293376, while the sum is 81.

The spelling of 21819981996396 in words is "twenty-one trillion, eight hundred nineteen billion, nine hundred eighty-one million, nine hundred ninety-six thousand, three hundred ninety-six".