21952637673 has 16 divisors (see below), whose sum is σ = 29434870080. Its totient is φ = 14552830656.

The previous prime is 21952637669. The next prime is 21952637719. The reversal of 21952637673 is 37673625912.

It is not a de Polignac number, because 21952637673 - 2² = 21952637669 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21952627673) 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 15 ways as a sum of consecutive naturals, for example, 1189986 + ... + 1208292.

It is an arithmetic number, because the mean of its divisors is an integer number (1839679380).

Almost surely, 2^21952637673 is an apocalyptic number.

It is an amenable number.

21952637673 is a deficient number, since it is larger than the sum of its proper divisors (7482232407).

21952637673 is a wasteful number, since it uses less digits than its factorization.

21952637673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20536.

The product of its digits is 2857680, while the sum is 51.

The spelling of 21952637673 in words is "twenty-one billion, nine hundred fifty-two million, six hundred thirty-seven thousand, six hundred seventy-three".