21726700732123 has 2 divisors, whose sum is σ = 21726700732124. Its totient is φ = 21726700732122.

The previous prime is 21726700732103. The next prime is 21726700732127. The reversal of 21726700732123 is 32123700762712.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21726700732123 - 2²⁹ = 21726163861211 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21726700732123.

It is not a weakly prime, because it can be changed into another prime (21726700732127) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10863350366061 + 10863350366062.

It is an arithmetic number, because the mean of its divisors is an integer number (10863350366062).

Almost surely, 2^{21726700732123} is an apocalyptic number.

21726700732123 is a deficient number, since it is larger than the sum of its proper divisors (1).

21726700732123 is an equidigital number, since it uses as much as digits as its factorization.

21726700732123 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 296352, while the sum is 43.

The spelling of 21726700732123 in words is "twenty-one trillion, seven hundred twenty-six billion, seven hundred million, seven hundred thirty-two thousand, one hundred twenty-three".