21112222012 has 12 divisors (see below), whose sum is σ = 42224444080. Its totient is φ = 9048095136.

The previous prime is 21112222009. The next prime is 21112222037. The reversal of 21112222012 is 21022221112.

It is a happy number.

21112222012 is an admirable number.

It is a congruent number.

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, 377003937 + ... + 377003992.

Almost surely, 2^21112222012 is an apocalyptic number.

It is an amenable number.

21112222012 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

21112222012 is a wasteful number, since it uses less digits than its factorization.

21112222012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 754007940 (or 754007938 counting only the distinct ones).

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

Adding to 21112222012 its reverse (21022221112), we get a palindrome (42134443124).

The spelling of 21112222012 in words is "twenty-one billion, one hundred twelve million, two hundred twenty-two thousand, twelve".