22011321997 has 12 divisors (see below), whose sum is σ = 25611283776. Its totient is φ = 18862222680.

The previous prime is 22011321973. The next prime is 22011322037. The reversal of 22011321997 is 79912311022.

It is a de Polignac number, because none of the positive numbers 2^k-22011321997 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22011321907) 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, 154972 + ... + 260842.

It is an arithmetic number, because the mean of its divisors is an integer number (2134273648).

Almost surely, 2^22011321997 is an apocalyptic number.

It is an amenable number.

22011321997 is a deficient number, since it is larger than the sum of its proper divisors (3599961779).

22011321997 is a wasteful number, since it uses less digits than its factorization.

22011321997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110128 (or 110121 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 37.

The spelling of 22011321997 in words is "twenty-two billion, eleven million, three hundred twenty-one thousand, nine hundred ninety-seven".