22910621 has 2 divisors, whose sum is σ = 22910622. Its totient is φ = 22910620.

The previous prime is 22910617. The next prime is 22910623. The reversal of 22910621 is 12601922.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15132100 + 7778521 = 3890^2 + 2789^2 .

It is a cyclic number.

It is not a de Polignac number, because 22910621 - 2² = 22910617 is a prime.

Together with 22910623, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22910623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11455310 + 11455311.

It is an arithmetic number, because the mean of its divisors is an integer number (11455311).

Almost surely, 2^22910621 is an apocalyptic number.

It is an amenable number.

22910621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22910621 is an equidigital number, since it uses as much as digits as its factorization.

22910621 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 22910621 is about 4786.5040478412. The cubic root of 22910621 is about 284.0178400815.

The spelling of 22910621 in words is "twenty-two million, nine hundred ten thousand, six hundred twenty-one".