22138091 has 4 divisors (see below), whose sum is σ = 22418400. Its totient is φ = 21857784.

The previous prime is 22138087. The next prime is 22138093. The reversal of 22138091 is 19083122.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 22138091 - 2² = 22138087 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 22138091.

It is not an unprimeable number, because it can be changed into a prime (22138093) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 140036 + ... + 140193.

It is an arithmetic number, because the mean of its divisors is an integer number (5604600).

Almost surely, 2^22138091 is an apocalyptic number.

22138091 is a deficient number, since it is larger than the sum of its proper divisors (280309).

22138091 is an equidigital number, since it uses as much as digits as its factorization.

22138091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 280308.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 22138091 is about 4705.1132823770. The cubic root of 22138091 is about 280.7889779780.

The spelling of 22138091 in words is "twenty-two million, one hundred thirty-eight thousand, ninety-one".