21021344222 has 24 divisors (see below), whose sum is σ = 33313161000. Its totient is φ = 9921061008.

The previous prime is 21021344191. The next prime is 21021344273. The reversal of 21021344222 is 22244312012.

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, 16696229 + ... + 16697487.

It is an arithmetic number, because the mean of its divisors is an integer number (1388048375).

Almost surely, 2^21021344222 is an apocalyptic number.

21021344222 is a deficient number, since it is larger than the sum of its proper divisors (12291816778).

21021344222 is an equidigital number, since it uses as much as digits as its factorization.

21021344222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2888 (or 1629 counting only the distinct ones).

The product of its (nonzero) digits is 1536, while the sum is 23.

Adding to 21021344222 its reverse (22244312012), we get a palindrome (43265656234).

The spelling of 21021344222 in words is "twenty-one billion, twenty-one million, three hundred forty-four thousand, two hundred twenty-two".