21971250882 has 24 divisors (see below), whose sum is σ = 54405002496. Its totient is φ = 6277500216.

The previous prime is 21971250863. The next prime is 21971250887. The reversal of 21971250882 is 28805217912.

It is not an unprimeable number, because it can be changed into a prime (21971250887) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 87187378 + ... + 87187629.

It is an arithmetic number, because the mean of its divisors is an integer number (2266875104).

Almost surely, 2^21971250882 is an apocalyptic number.

21971250882 is an abundant number, since it is smaller than the sum of its proper divisors (32433751614).

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

21971250882 is a wasteful number, since it uses less digits than its factorization.

21971250882 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 174375022 (or 174375019 counting only the distinct ones).

The product of its (nonzero) digits is 161280, while the sum is 45.

The spelling of 21971250882 in words is "twenty-one billion, nine hundred seventy-one million, two hundred fifty thousand, eight hundred eighty-two".