21124099988 has 12 divisors (see below), whose sum is σ = 36979440960. Its totient is φ = 10558545432.

The previous prime is 21124099963. The next prime is 21124100027. The reversal of 21124099988 is 88999042112.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 862556 + ... + 886707.

It is an arithmetic number, because the mean of its divisors is an integer number (3081620080).

Almost surely, 2^21124099988 is an apocalyptic number.

It is an amenable number.

21124099988 is a deficient number, since it is larger than the sum of its proper divisors (15855340972).

21124099988 is a wasteful number, since it uses less digits than its factorization.

21124099988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1752286 (or 1752284 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 53.

The spelling of 21124099988 in words is "twenty-one billion, one hundred twenty-four million, ninety-nine thousand, nine hundred eighty-eight".