21750636944939 has 16 divisors (see below), whose sum is σ = 25109453029056. Its totient is φ = 18454796784000.

The previous prime is 21750636944903. The next prime is 21750636944941. The reversal of 21750636944939 is 93944963605712.

It is a cyclic number.

It is not a de Polignac number, because 21750636944939 - 2¹⁶ = 21750636879403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21750636944039) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 96092 + ... + 6596249.

It is an arithmetic number, because the mean of its divisors is an integer number (1569340814316).

Almost surely, 2^{21750636944939} is an apocalyptic number.

21750636944939 is a deficient number, since it is larger than the sum of its proper divisors (3358816084117).

21750636944939 is a wasteful number, since it uses less digits than its factorization.

21750636944939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6697046.

The product of its (nonzero) digits is 264539520, while the sum is 68.

The spelling of 21750636944939 in words is "twenty-one trillion, seven hundred fifty billion, six hundred thirty-six million, nine hundred forty-four thousand, nine hundred thirty-nine".