22021191 has 12 divisors (see below), whose sum is σ = 32834880. Its totient is φ = 14207040.

The previous prime is 22021177. The next prime is 22021211. The reversal of 22021191 is 19112022.

It is not a de Polignac number, because 22021191 - 2⁵ = 22021159 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021151) 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, 39186 + ... + 39743.

It is an arithmetic number, because the mean of its divisors is an integer number (2736240).

Almost surely, 2^22021191 is an apocalyptic number.

22021191 is a deficient number, since it is larger than the sum of its proper divisors (10813689).

22021191 is a wasteful number, since it uses less digits than its factorization.

22021191 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78966 (or 78963 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 22021191 is about 4692.6741843005. The cubic root of 22021191 is about 280.2938708849.

The spelling of 22021191 in words is "twenty-two million, twenty-one thousand, one hundred ninety-one".