22122991 has 8 divisors (see below), whose sum is σ = 24280704. Its totient is φ = 19989720.

The previous prime is 22122983. The next prime is 22123021. The reversal of 22122991 is 19922122.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 22122991 - 2³ = 22122983 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 (22122901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4185 + ... + 7858.

It is an arithmetic number, because the mean of its divisors is an integer number (3035088).

Almost surely, 2^22122991 is an apocalyptic number.

22122991 is a deficient number, since it is larger than the sum of its proper divisors (2157713).

22122991 is a wasteful number, since it uses less digits than its factorization.

22122991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12221.

The product of its digits is 1296, while the sum is 28.

The square root of 22122991 is about 4703.5083714181. The cubic root of 22122991 is about 280.7251230605.

The spelling of 22122991 in words is "twenty-two million, one hundred twenty-two thousand, nine hundred ninety-one".