21222311124 has 96 divisors (see below), whose sum is σ = 57152471040. Its totient is φ = 6003752832.

The previous prime is 21222311113. The next prime is 21222311137. The reversal of 21222311124 is 42111322212.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 21222311124.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6260422 + ... + 6263810.

It is an arithmetic number, because the mean of its divisors is an integer number (595338240).

Almost surely, 2^21222311124 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21222311124, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28576235520).

21222311124 is an abundant number, since it is smaller than the sum of its proper divisors (35930159916).

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

21222311124 is a wasteful number, since it uses less digits than its factorization.

21222311124 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4117 (or 4115 counting only the distinct ones).

The product of its digits is 384, while the sum is 21.

Adding to 21222311124 its reverse (42111322212), we get a palindrome (63333633336).

The spelling of 21222311124 in words is "twenty-one billion, two hundred twenty-two million, three hundred eleven thousand, one hundred twenty-four".