22121020012 has 72 divisors (see below), whose sum is σ = 48748441056. Its totient is φ = 8705636352.

The previous prime is 22121020001. The next prime is 22121020027. The reversal of 22121020012 is 21002012122.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 22121019974 and 22121020001.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 469273 + ... + 514255.

Almost surely, 2^22121020012 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 22121020012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24374220528).

22121020012 is an abundant number, since it is smaller than the sum of its proper divisors (26627421044).

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

22121020012 is a wasteful number, since it uses less digits than its factorization.

22121020012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45207 (or 45198 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 22121020012 its reverse (21002012122), we get a palindrome (43123032134).

The spelling of 22121020012 in words is "twenty-two billion, one hundred twenty-one million, twenty thousand, twelve".