21220202112 has 64 divisors (see below), whose sum is σ = 57889610400. Its totient is φ = 6882223104.

The previous prime is 21220202083. The next prime is 21220202131. The reversal of 21220202112 is 21120202212.

It is a tau number, because it is divible by the number of its divisors (64).

It is a junction number, because it is equal to n+sod(n) for n = 21220202091 and 21220202100.

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, 732562 + ... + 760977.

Almost surely, 2^21220202112 is an apocalyptic number.

It is an amenable number.

21220202112 is an abundant number, since it is smaller than the sum of its proper divisors (36669408288).

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

21220202112 is a wasteful number, since it uses less digits than its factorization.

21220202112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1493593 (or 1493581 counting only the distinct ones).

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

Adding to 21220202112 its reverse (21120202212), we get a palindrome (42340404324).

The spelling of 21220202112 in words is "twenty-one billion, two hundred twenty million, two hundred two thousand, one hundred twelve".