21222102012 has 24 divisors (see below), whose sum is σ = 49571566800. Its totient is φ = 7066415616.

The previous prime is 21222101987. The next prime is 21222102023. The reversal of 21222102012 is 21020122212.

It is a super-2 number, since 2×21222102012² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21222101982 and 21222102000.

It is a congruent number.

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, 940687 + ... + 962982.

It is an arithmetic number, because the mean of its divisors is an integer number (2065481950).

Almost surely, 2^21222102012 is an apocalyptic number.

It is an amenable number.

21222102012 is an abundant number, since it is smaller than the sum of its proper divisors (28349464788).

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

21222102012 is a wasteful number, since it uses less digits than its factorization.

21222102012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1904605 (or 1904603 counting only the distinct ones).

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

Adding to 21222102012 its reverse (21020122212), we get a palindrome (42242224224).

The spelling of 21222102012 in words is "twenty-one billion, two hundred twenty-two million, one hundred two thousand, twelve".