21922235 has 4 divisors (see below), whose sum is σ = 26306688. Its totient is φ = 17537784.

The previous prime is 21922223. The next prime is 21922237. The reversal of 21922235 is 53222912.

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 21922235 - 2⁶ = 21922171 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21922237) 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, 2192219 + ... + 2192228.

It is an arithmetic number, because the mean of its divisors is an integer number (6576672).

Almost surely, 2^21922235 is an apocalyptic number.

21922235 is a deficient number, since it is larger than the sum of its proper divisors (4384453).

21922235 is an equidigital number, since it uses as much as digits as its factorization.

21922235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4384452.

The product of its digits is 2160, while the sum is 26.

The square root of 21922235 is about 4682.1186443746. The cubic root of 21922235 is about 279.8733908884.

The spelling of 21922235 in words is "twenty-one million, nine hundred twenty-two thousand, two hundred thirty-five".