21868884705 has 16 divisors (see below), whose sum is σ = 35038897920. Its totient is φ = 11647177728.

The previous prime is 21868884691. The next prime is 21868884733. The reversal of 21868884705 is 50748886812.

It is not a de Polignac number, because 21868884705 - 2⁶ = 21868884641 is a prime.

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 15 ways as a sum of consecutive naturals, for example, 1003072 + ... + 1024641.

It is an arithmetic number, because the mean of its divisors is an integer number (2189931120).

Almost surely, 2^21868884705 is an apocalyptic number.

It is an amenable number.

21868884705 is a deficient number, since it is larger than the sum of its proper divisors (13170013215).

21868884705 is a wasteful number, since it uses less digits than its factorization.

21868884705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2028440.

The product of its (nonzero) digits is 6881280, while the sum is 57.

The spelling of 21868884705 in words is "twenty-one billion, eight hundred sixty-eight million, eight hundred eighty-four thousand, seven hundred five".