21877549723 has 2 divisors, whose sum is σ = 21877549724. Its totient is φ = 21877549722.

The previous prime is 21877549697. The next prime is 21877549763. The reversal of 21877549723 is 32794577812.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21877549723 - 2²⁵ = 21843995291 is a prime.

It is not a weakly prime, because it can be changed into another prime (21877549763) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10938774861 + 10938774862.

It is an arithmetic number, because the mean of its divisors is an integer number (10938774862).

Almost surely, 2^21877549723 is an apocalyptic number.

21877549723 is a deficient number, since it is larger than the sum of its proper divisors (1).

21877549723 is an equidigital number, since it uses as much as digits as its factorization.

21877549723 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5927040, while the sum is 55.

The spelling of 21877549723 in words is "twenty-one billion, eight hundred seventy-seven million, five hundred forty-nine thousand, seven hundred twenty-three".