21022202112 has 144 divisors (see below), whose sum is σ = 58986504192. Its totient is φ = 6636718080.

The previous prime is 21022202107. The next prime is 21022202209. The reversal of 21022202112 is 21120222012.

It is a junction number, because it is equal to n+sod(n) for n = 21022202091 and 21022202100.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1109583 + ... + 1128369.

Almost surely, 2^21022202112 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 21022202112, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29493252096).

21022202112 is an abundant number, since it is smaller than the sum of its proper divisors (37964302080).

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

21022202112 is a wasteful number, since it uses less digits than its factorization.

21022202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18884 (or 18870 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 15.

Adding to 21022202112 its reverse (21120222012), we get a palindrome (42142424124).

The spelling of 21022202112 in words is "twenty-one billion, twenty-two million, two hundred two thousand, one hundred twelve".