21212210112 has 56 divisors (see below), whose sum is σ = 57640856016. Its totient is φ = 6879633408.

The previous prime is 21212210101. The next prime is 21212210113. The reversal of 21212210112 is 21101221212.

It is a junction number, because it is equal to n+sod(n) for n = 21212210091 and 21212210100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21212210113) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1485873 + ... + 1500080.

Almost surely, 2^21212210112 is an apocalyptic number.

It is an amenable number.

21212210112 is an abundant number, since it is smaller than the sum of its proper divisors (36428645904).

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

21212210112 is a wasteful number, since it uses less digits than its factorization.

21212210112 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2986005 (or 2985995 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21212210112 its reverse (21101221212), we get a palindrome (42313431324).

The spelling of 21212210112 in words is "twenty-one billion, two hundred twelve million, two hundred ten thousand, one hundred twelve".