21222122012 has 48 divisors (see below), whose sum is σ = 46824076992. Its totient is φ = 8190789120.

The previous prime is 21222121993. The next prime is 21222122027. The reversal of 21222122012 is 21022122212.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 696083 + ... + 725930.

It is an arithmetic number, because the mean of its divisors is an integer number (975501604).

Almost surely, 2^21222122012 is an apocalyptic number.

It is an amenable number.

21222122012 is an abundant number, since it is smaller than the sum of its proper divisors (25601954980).

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

21222122012 is a wasteful number, since it uses less digits than its factorization.

21222122012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1422078 (or 1422076 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 17.

Adding to 21222122012 its reverse (21022122212), we get a palindrome (42244244224).

The spelling of 21222122012 in words is "twenty-one billion, two hundred twenty-two million, one hundred twenty-two thousand, twelve".