21272122224 has 60 divisors (see below), whose sum is σ = 61585251000. Its totient is φ = 6846198912.

The previous prime is 21272122211. The next prime is 21272122271. The reversal of 21272122224 is 42222127212.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2542774 + ... + 2551125.

It is an arithmetic number, because the mean of its divisors is an integer number (1026420850).

Almost surely, 2^21272122224 is an apocalyptic number.

21272122224 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21272122224 is an abundant number, since it is smaller than the sum of its proper divisors (40313128776).

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

21272122224 is a wasteful number, since it uses less digits than its factorization.

21272122224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5093942 (or 5093933 counting only the distinct ones).

The product of its digits is 3584, while the sum is 27.

Adding to 21272122224 its reverse (42222127212), we get a palindrome (63494249436).

The spelling of 21272122224 in words is "twenty-one billion, two hundred seventy-two million, one hundred twenty-two thousand, two hundred twenty-four".