21506922898 has 8 divisors (see below), whose sum is σ = 32263607808. Its totient is φ = 10752386964.

The previous prime is 21506922859. The next prime is 21506922967. The reversal of 21506922898 is 89822960512.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 511986 + ... + 552397.

It is an arithmetic number, because the mean of its divisors is an integer number (4032950976).

Almost surely, 2^21506922898 is an apocalyptic number.

21506922898 is a deficient number, since it is larger than the sum of its proper divisors (10756684910).

21506922898 is a wasteful number, since it uses less digits than its factorization.

21506922898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1074488.

The product of its (nonzero) digits is 1244160, while the sum is 52.

The spelling of 21506922898 in words is "twenty-one billion, five hundred six million, nine hundred twenty-two thousand, eight hundred ninety-eight".