22894721 has 2 divisors, whose sum is σ = 22894722. Its totient is φ = 22894720.

The previous prime is 22894693. The next prime is 22894723. The reversal of 22894721 is 12749822.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20611600 + 2283121 = 4540^2 + 1511^2 .

It is a cyclic number.

It is not a de Polignac number, because 22894721 - 2⁶ = 22894657 is a prime.

Together with 22894723, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (22894723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11447360 + 11447361.

It is an arithmetic number, because the mean of its divisors is an integer number (11447361).

Almost surely, 2^22894721 is an apocalyptic number.

It is an amenable number.

22894721 is a deficient number, since it is larger than the sum of its proper divisors (1).

22894721 is an equidigital number, since it uses as much as digits as its factorization.

22894721 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 35.

The square root of 22894721 is about 4784.8428396343. The cubic root of 22894721 is about 283.9521219627.

It can be divided in two parts, 228 and 94721, that added together give a palindrome (94949).

The spelling of 22894721 in words is "twenty-two million, eight hundred ninety-four thousand, seven hundred twenty-one".