22121011212 has 48 divisors (see below), whose sum is σ = 54458611200. Its totient is φ = 6969343680.

The previous prime is 22121011183. The next prime is 22121011229. The reversal of 22121011212 is 21211012122.

It is a junction number, because it is equal to n+sod(n) for n = 22121011191 and 22121011200.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14287 + ... + 210822.

It is an arithmetic number, because the mean of its divisors is an integer number (1134554400).

Almost surely, 2^22121011212 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 22121011212, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27229305600).

22121011212 is an abundant number, since it is smaller than the sum of its proper divisors (32337599988).

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

22121011212 is a wasteful number, since it uses less digits than its factorization.

22121011212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225566 (or 225564 counting only the distinct ones).

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

Adding to 22121011212 its reverse (21211012122), we get a palindrome (43332023334).

The spelling of 22121011212 in words is "twenty-two billion, one hundred twenty-one million, eleven thousand, two hundred twelve".