22998877721 has 4 divisors (see below), whose sum is σ = 23791942500. Its totient is φ = 22205812944.

The previous prime is 22998877691. The next prime is 22998877739. The reversal of 22998877721 is 12777889922.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 13285789696 + 9713088025 = 115264^2 + 98555^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22998877721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22998877621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396532346 + ... + 396532403.

It is an arithmetic number, because the mean of its divisors is an integer number (5947985625).

Almost surely, 2^22998877721 is an apocalyptic number.

It is an amenable number.

22998877721 is a deficient number, since it is larger than the sum of its proper divisors (793064779).

22998877721 is an equidigital number, since it uses as much as digits as its factorization.

22998877721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 793064778.

The product of its digits is 14224896, while the sum is 62.

The spelling of 22998877721 in words is "twenty-two billion, nine hundred ninety-eight million, eight hundred seventy-seven thousand, seven hundred twenty-one".