22622221 has 2 divisors, whose sum is σ = 22622222. Its totient is φ = 22622220.

The previous prime is 22622213. The next prime is 22622227. The reversal of 22622221 is 12222622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15888196 + 6734025 = 3986^2 + 2595^2 .

It is a cyclic number.

It is not a de Polignac number, because 22622221 - 2³ = 22622213 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22622227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11311110 + 11311111.

It is an arithmetic number, because the mean of its divisors is an integer number (11311111).

Almost surely, 2^22622221 is an apocalyptic number.

It is an amenable number.

22622221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22622221 is an equidigital number, since it uses as much as digits as its factorization.

22622221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 384, while the sum is 19.

The square root of 22622221 is about 4756.2822666448. The cubic root of 22622221 is about 282.8210608257.

Adding to 22622221 its reverse (12222622), we get a palindrome (34844843).

The spelling of 22622221 in words is "twenty-two million, six hundred twenty-two thousand, two hundred twenty-one".