21958115922 has 54 divisors (see below), whose sum is σ = 48564207237. Its totient is φ = 7170373392.

The previous prime is 21958115903. The next prime is 21958115929. The reversal of 21958115922 is 22951185912.

It is a happy number.

21958115922 is a `hidden beast` number, since 2 + 1 + 9 + 58 + 1 + 1 + 592 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 20828551041 + 1129564881 = 144321^2 + 33609^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=104781.

It is not an unprimeable number, because it can be changed into a prime (21958115929) by changing a digit.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 33320029 + ... + 33320687.

Almost surely, 2^21958115922 is an apocalyptic number.

21958115922 is an abundant number, since it is smaller than the sum of its proper divisors (26606091315).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21958115922 is an frugal number, since it uses more digits than its factorization.

21958115922 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1432 (or 717 counting only the distinct ones).

The product of its digits is 129600, while the sum is 45.

The spelling of 21958115922 in words is "twenty-one billion, nine hundred fifty-eight million, one hundred fifteen thousand, nine hundred twenty-two".