22121807904 has 72 divisors (see below), whose sum is σ = 71895882240. Its totient is φ = 6320515968.

The previous prime is 22121807899. The next prime is 22121807909. The reversal of 22121807904 is 40970812122.

It is an interprime number because it is at equal distance from previous prime (22121807899) and next prime (22121807909).

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (22121807909) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5484544 + ... + 5488575.

It is an arithmetic number, because the mean of its divisors is an integer number (998553920).

Almost surely, 2^22121807904 is an apocalyptic number.

22121807904 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

22121807904 is an abundant number, since it is smaller than the sum of its proper divisors (49774074336).

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

22121807904 is a wasteful number, since it uses less digits than its factorization.

22121807904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10973142 (or 10973131 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The spelling of 22121807904 in words is "twenty-two billion, one hundred twenty-one million, eight hundred seven thousand, nine hundred four".