21926790929 has 8 divisors (see below), whose sum is σ = 22293085800. Its totient is φ = 21560716800.

The previous prime is 21926790877. The next prime is 21926790937. The reversal of 21926790929 is 92909762912.

It can be written as a sum of positive squares in 4 ways, for example, as 1292043025 + 20634747904 = 35945^2 + 143648^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21926790929 - 2⁸ = 21926790673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21926790329) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 151547 + ... + 258495.

It is an arithmetic number, because the mean of its divisors is an integer number (2786635725).

Almost surely, 2^21926790929 is an apocalyptic number.

It is an amenable number.

21926790929 is a deficient number, since it is larger than the sum of its proper divisors (366294871).

21926790929 is a wasteful number, since it uses less digits than its factorization.

21926790929 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110371.

The product of its (nonzero) digits is 2204496, while the sum is 56.

The spelling of 21926790929 in words is "twenty-one billion, nine hundred twenty-six million, seven hundred ninety thousand, nine hundred twenty-nine".