22571621 has 2 divisors, whose sum is σ = 22571622. Its totient is φ = 22571620.

The previous prime is 22571573. The next prime is 22571623. The reversal of 22571621 is 12617522.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20802721 + 1768900 = 4561^2 + 1330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22571621 is a prime.

Together with 22571623, 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 (22571623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11285810 + 11285811.

It is an arithmetic number, because the mean of its divisors is an integer number (11285811).

Almost surely, 2^22571621 is an apocalyptic number.

It is an amenable number.

22571621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22571621 is an equidigital number, since it uses as much as digits as its factorization.

22571621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1680, while the sum is 26.

The square root of 22571621 is about 4750.9600082510. The cubic root of 22571621 is about 282.6100377972.

The spelling of 22571621 in words is "twenty-two million, five hundred seventy-one thousand, six hundred twenty-one".