21956126982 has 16 divisors (see below), whose sum is σ = 44468106240. Its totient is φ = 7226066952.

The previous prime is 21956126981. The next prime is 21956126987. The reversal of 21956126982 is 28962165912.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21956126981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23159998 + ... + 23160945.

It is an arithmetic number, because the mean of its divisors is an integer number (2779256640).

Almost surely, 2^21956126982 is an apocalyptic number.

21956126982 is an abundant number, since it is smaller than the sum of its proper divisors (22511979258).

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

21956126982 is a wasteful number, since it uses less digits than its factorization.

21956126982 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46321027.

The product of its digits is 933120, while the sum is 51.

The spelling of 21956126982 in words is "twenty-one billion, nine hundred fifty-six million, one hundred twenty-six thousand, nine hundred eighty-two".