21222202112 has 72 divisors (see below), whose sum is σ = 43493049600. Its totient is φ = 10329338880.

The previous prime is 21222202109. The next prime is 21222202151. The reversal of 21222202112 is 21120222212.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3420389 + ... + 3426587.

Almost surely, 2^21222202112 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 21222202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21746524800).

21222202112 is an abundant number, since it is smaller than the sum of its proper divisors (22270847488).

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

21222202112 is an equidigital number, since it uses as much as digits as its factorization.

21222202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6569 (or 6555 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21222202112 its reverse (21120222212), we get a palindrome (42342424324).

The spelling of 21222202112 in words is "twenty-one billion, two hundred twenty-two million, two hundred two thousand, one hundred twelve".