22121210428 has 12 divisors (see below), whose sum is σ = 38774662360. Its totient is φ = 11042735472.

The previous prime is 22121210383. The next prime is 22121210429. The reversal of 22121210428 is 82401212122.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22121210429) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4464651 + ... + 4469602.

Almost surely, 2^22121210428 is an apocalyptic number.

It is an amenable number.

22121210428 is a deficient number, since it is larger than the sum of its proper divisors (16653451932).

22121210428 is a wasteful number, since it uses less digits than its factorization.

22121210428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8934876 (or 8934874 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 25.

The spelling of 22121210428 in words is "twenty-two billion, one hundred twenty-one million, two hundred ten thousand, four hundred twenty-eight".