22001121987 has 16 divisors (see below), whose sum is σ = 31840112640. Its totient is φ = 13432541472.

The previous prime is 22001121959. The next prime is 22001122019. The reversal of 22001121987 is 78912110022.

It is not a de Polignac number, because 22001121987 - 2⁷ = 22001121859 is a prime.

It is not an unprimeable number, because it can be changed into a prime (22001121907) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2216037 + ... + 2225942.

It is an arithmetic number, because the mean of its divisors is an integer number (1990007040).

Almost surely, 2^22001121987 is an apocalyptic number.

22001121987 is a deficient number, since it is larger than the sum of its proper divisors (9838990653).

22001121987 is a wasteful number, since it uses less digits than its factorization.

22001121987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4442122.

The product of its (nonzero) digits is 4032, while the sum is 33.

The spelling of 22001121987 in words is "twenty-two billion, one million, one hundred twenty-one thousand, nine hundred eighty-seven".