21598093881 has 64 divisors (see below), whose sum is σ = 39437475840. Its totient is φ = 11376106560.

The previous prime is 21598093871. The next prime is 21598093931. The reversal of 21598093881 is 18839089512.

It is not a de Polignac number, because 21598093881 - 2⁷ = 21598093753 is a prime.

It is a super-2 number, since 2×21598093881² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21598093831) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1819636 + ... + 1831466.

It is an arithmetic number, because the mean of its divisors is an integer number (616210560).

Almost surely, 2^21598093881 is an apocalyptic number.

21598093881 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

21598093881 is a deficient number, since it is larger than the sum of its proper divisors (17839381959).

21598093881 is a wasteful number, since it uses less digits than its factorization.

21598093881 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12603 (or 12597 counting only the distinct ones).

The product of its (nonzero) digits is 1244160, while the sum is 54.

The spelling of 21598093881 in words is "twenty-one billion, five hundred ninety-eight million, ninety-three thousand, eight hundred eighty-one".