21990362723 has 32 divisors (see below), whose sum is σ = 25922688000. Its totient is φ = 18267410304.

The previous prime is 21990362623. The next prime is 21990362729. The reversal of 21990362723 is 32726309912.

It is a cyclic number.

It is not a de Polignac number, because 21990362723 - 2²⁸ = 21721927267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21990362729) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7615586 + ... + 7618472.

It is an arithmetic number, because the mean of its divisors is an integer number (810084000).

Almost surely, 2^21990362723 is an apocalyptic number.

21990362723 is a deficient number, since it is larger than the sum of its proper divisors (3932325277).

21990362723 is a wasteful number, since it uses less digits than its factorization.

21990362723 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3219.

The product of its (nonzero) digits is 244944, while the sum is 44.

The spelling of 21990362723 in words is "twenty-one billion, nine hundred ninety million, three hundred sixty-two thousand, seven hundred twenty-three".