22004431 has 2 divisors, whose sum is σ = 22004432. Its totient is φ = 22004430.

The previous prime is 22004429. The next prime is 22004441. The reversal of 22004431 is 13440022.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 22004431 - 2¹ = 22004429 is a prime.

It is a super-2 number, since 2×22004431² = 968389967267522, which contains 22 as substring.

Together with 22004429, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22004441) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11002215 + 11002216.

It is an arithmetic number, because the mean of its divisors is an integer number (11002216).

Almost surely, 2^22004431 is an apocalyptic number.

22004431 is a deficient number, since it is larger than the sum of its proper divisors (1).

22004431 is an equidigital number, since it uses as much as digits as its factorization.

22004431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 22004431 is about 4690.8880822292. Note that the first 3 decimals coincide. The cubic root of 22004431 is about 280.2227436759. Note that the first 3 decimals are identical.

Adding to 22004431 its reverse (13440022), we get a palindrome (35444453).

The spelling of 22004431 in words is "twenty-two million, four thousand, four hundred thirty-one".