22129091 has 4 divisors (see below), whose sum is σ = 23293800. Its totient is φ = 20964384.

The previous prime is 22129061. The next prime is 22129097. The reversal of 22129091 is 19092122.

It is a happy number.

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 22129091 - 2⁶ = 22129027 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 22129091.

It is not an unprimeable number, because it can be changed into a prime (22129097) 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, 582326 + ... + 582363.

It is an arithmetic number, because the mean of its divisors is an integer number (5823450).

Almost surely, 2^22129091 is an apocalyptic number.

22129091 is a deficient number, since it is larger than the sum of its proper divisors (1164709).

22129091 is a wasteful number, since it uses less digits than its factorization.

22129091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164708.

The product of its (nonzero) digits is 648, while the sum is 26.

The square root of 22129091 is about 4704.1567788500. The cubic root of 22129091 is about 280.7509222526.

The spelling of 22129091 in words is "twenty-two million, one hundred twenty-nine thousand, ninety-one".