21926967121 has 4 divisors (see below), whose sum is σ = 22519587892. Its totient is φ = 21334346352.

The previous prime is 21926967107. The next prime is 21926967137. The reversal of 21926967121 is 12176962912.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 10464267025 + 11462700096 = 102295^2 + 107064^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21926967121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21926967191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 296310330 + ... + 296310403.

It is an arithmetic number, because the mean of its divisors is an integer number (5629896973).

Almost surely, 2^21926967121 is an apocalyptic number.

It is an amenable number.

21926967121 is a deficient number, since it is larger than the sum of its proper divisors (592620771).

21926967121 is an equidigital number, since it uses as much as digits as its factorization.

21926967121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592620770.

The product of its digits is 163296, while the sum is 46.

The spelling of 21926967121 in words is "twenty-one billion, nine hundred twenty-six million, nine hundred sixty-seven thousand, one hundred twenty-one".