21122210212 has 12 divisors (see below), whose sum is σ = 36967190400. Its totient is φ = 10560155816.

The previous prime is 21122210209. The next prime is 21122210297. The reversal of 21122210212 is 21201222112.

It is a happy number.

It is a super-2 number, since 2×21122210212² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 186028 + ... + 277219.

It is an arithmetic number, because the mean of its divisors is an integer number (3080599200).

Almost surely, 2^21122210212 is an apocalyptic number.

It is an amenable number.

21122210212 is a deficient number, since it is larger than the sum of its proper divisors (15844980188).

21122210212 is a wasteful number, since it uses less digits than its factorization.

21122210212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474650 (or 474648 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 21122210212 its reverse (21201222112), we get a palindrome (42323432324).

The spelling of 21122210212 in words is "twenty-one billion, one hundred twenty-two million, two hundred ten thousand, two hundred twelve".