21372777723 has 16 divisors (see below), whose sum is σ = 32916364416. Its totient is φ = 12191245440.

The previous prime is 21372777709. The next prime is 21372777871. The reversal of 21372777723 is 32777727312.

It is not a de Polignac number, because 21372777723 - 2⁵ = 21372777691 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21372779723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19048261 + ... + 19049382.

It is an arithmetic number, because the mean of its divisors is an integer number (2057272776).

Almost surely, 2^21372777723 is an apocalyptic number.

21372777723 is a deficient number, since it is larger than the sum of its proper divisors (11543586693).

21372777723 is a wasteful number, since it uses less digits than its factorization.

21372777723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38097674.

The product of its digits is 1210104, while the sum is 48.

The spelling of 21372777723 in words is "twenty-one billion, three hundred seventy-two million, seven hundred seventy-seven thousand, seven hundred twenty-three".