21223132124 has 12 divisors (see below), whose sum is σ = 37295882400. Its totient is φ = 10567165728.

The previous prime is 21223132123. The next prime is 21223132153. The reversal of 21223132124 is 42123132212.

It is a self number, because there is not a number n which added to its sum of digits gives 21223132124.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21223132123) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11099009 + ... + 11100920.

It is an arithmetic number, because the mean of its divisors is an integer number (3107990200).

Almost surely, 2^21223132124 is an apocalyptic number.

It is an amenable number.

21223132124 is a deficient number, since it is larger than the sum of its proper divisors (16072750276).

21223132124 is a wasteful number, since it uses less digits than its factorization.

21223132124 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22200172 (or 22200170 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

Adding to 21223132124 its reverse (42123132212), we get a palindrome (63346264336).

The spelling of 21223132124 in words is "twenty-one billion, two hundred twenty-three million, one hundred thirty-two thousand, one hundred twenty-four".