21954829631 has 16 divisors (see below), whose sum is σ = 26708601600. Its totient is φ = 17627658048.

The previous prime is 21954829627. The next prime is 21954829649. The reversal of 21954829631 is 13692845912.

It is not a de Polignac number, because 21954829631 - 2² = 21954829627 is a prime.

It is a super-2 number, since 2×21954829631² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21954829631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21954829031) 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, 915545 + ... + 939218.

It is an arithmetic number, because the mean of its divisors is an integer number (1669287600).

Almost surely, 2^21954829631 is an apocalyptic number.

21954829631 is a deficient number, since it is larger than the sum of its proper divisors (4753771969).

21954829631 is a wasteful number, since it uses less digits than its factorization.

21954829631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1854878.

The product of its digits is 933120, while the sum is 50.

The spelling of 21954829631 in words is "twenty-one billion, nine hundred fifty-four million, eight hundred twenty-nine thousand, six hundred thirty-one".