21099164984 has 16 divisors (see below), whose sum is σ = 41888048400. Its totient is φ = 9929018752.

The previous prime is 21099164971. The next prime is 21099164993. The reversal of 21099164984 is 48946199012.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77570324 + ... + 77570595.

It is an arithmetic number, because the mean of its divisors is an integer number (2618003025).

Almost surely, 2^21099164984 is an apocalyptic number.

It is an amenable number.

21099164984 is a deficient number, since it is larger than the sum of its proper divisors (20788883416).

21099164984 is a wasteful number, since it uses less digits than its factorization.

21099164984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155140942 (or 155140938 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 53.

The spelling of 21099164984 in words is "twenty-one billion, ninety-nine million, one hundred sixty-four thousand, nine hundred eighty-four".