22213621 has 2 divisors, whose sum is σ = 22213622. Its totient is φ = 22213620.

The previous prime is 22213619. The next prime is 22213627. The reversal of 22213621 is 12631222.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21958596 + 255025 = 4686^2 + 505^2 .

It is a cyclic number.

It is not a de Polignac number, because 22213621 - 2¹ = 22213619 is a prime.

Together with 22213619, 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 (22213627) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11106810 + 11106811.

It is an arithmetic number, because the mean of its divisors is an integer number (11106811).

Almost surely, 2^22213621 is an apocalyptic number.

It is an amenable number.

22213621 is a deficient number, since it is larger than the sum of its proper divisors (1).

22213621 is an equidigital number, since it uses as much as digits as its factorization.

22213621 is an evil number, because the sum of its binary digits is even.

The product of its digits is 288, while the sum is 19.

The square root of 22213621 is about 4713.1328222319. The cubic root of 22213621 is about 281.1079443275.

Adding to 22213621 its reverse (12631222), we get a palindrome (34844843).

The spelling of 22213621 in words is "twenty-two million, two hundred thirteen thousand, six hundred twenty-one".