22121661008 has 40 divisors (see below), whose sum is σ = 44318520576. Its totient is φ = 10685836800.

The previous prime is 22121660969. The next prime is 22121661011. The reversal of 22121661008 is 80016612122.

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, 256523 + ... + 331733.

Almost surely, 2^22121661008 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 22121661008, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22159260288).

22121661008 is an abundant number, since it is smaller than the sum of its proper divisors (22196859568).

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

22121661008 is a wasteful number, since it uses less digits than its factorization.

22121661008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75843 (or 75837 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The spelling of 22121661008 in words is "twenty-two billion, one hundred twenty-one million, six hundred sixty-one thousand, eight".