21100230988 has 12 divisors (see below), whose sum is σ = 38198694240. Its totient is φ = 10186318352.

The previous prime is 21100230967. The next prime is 21100230989. The reversal of 21100230988 is 88903200112.

It is a super-2 number, since 2×21100230988² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21100230989) 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, 90949156 + ... + 90949387.

It is an arithmetic number, because the mean of its divisors is an integer number (3183224520).

Almost surely, 2^21100230988 is an apocalyptic number.

It is an amenable number.

21100230988 is a deficient number, since it is larger than the sum of its proper divisors (17098463252).

21100230988 is a wasteful number, since it uses less digits than its factorization.

21100230988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181898576 (or 181898574 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 34.

The spelling of 21100230988 in words is "twenty-one billion, one hundred million, two hundred thirty thousand, nine hundred eighty-eight".