21722051140 has 24 divisors (see below), whose sum is σ = 46677153600. Its totient is φ = 8486754528.

The previous prime is 21722051129. The next prime is 21722051149. The reversal of 21722051140 is 4115022712.

It is not an unprimeable number, because it can be changed into a prime (21722051149) 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, 12628240 + ... + 12629959.

It is an arithmetic number, because the mean of its divisors is an integer number (1944881400).

Almost surely, 2^21722051140 is an apocalyptic number.

21722051140 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21722051140 is an abundant number, since it is smaller than the sum of its proper divisors (24955102460).

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

21722051140 is a wasteful number, since it uses less digits than its factorization.

21722051140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25258251 (or 25258249 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 25.

Adding to 21722051140 its reverse (4115022712), we get a palindrome (25837073852).

The spelling of 21722051140 in words is "twenty-one billion, seven hundred twenty-two million, fifty-one thousand, one hundred forty".