22191907 has 4 divisors (see below), whose sum is σ = 22399416. Its totient is φ = 21984400.

The previous prime is 22191901. The next prime is 22191937. The reversal of 22191907 is 70919122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70919122 = 2 ⋅35459561.

It is a cyclic number.

It is not a de Polignac number, because 22191907 - 2⁷ = 22191779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (22191901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 103594 + ... + 103807.

It is an arithmetic number, because the mean of its divisors is an integer number (5599854).

Almost surely, 2^22191907 is an apocalyptic number.

22191907 is a deficient number, since it is larger than the sum of its proper divisors (207509).

22191907 is a wasteful number, since it uses less digits than its factorization.

22191907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207508.

The product of its (nonzero) digits is 2268, while the sum is 31.

The square root of 22191907 is about 4710.8286956755. The cubic root of 22191907 is about 281.0163193454.

The spelling of 22191907 in words is "twenty-two million, one hundred ninety-one thousand, nine hundred seven".