22214921 has 2 divisors, whose sum is σ = 22214922. Its totient is φ = 22214920.

The previous prime is 22214909. The next prime is 22214923. The reversal of 22214921 is 12941222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21724921 + 490000 = 4661^2 + 700^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22214921 is a prime.

Together with 22214923, 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 (22214923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11107460 + 11107461.

It is an arithmetic number, because the mean of its divisors is an integer number (11107461).

Almost surely, 2^22214921 is an apocalyptic number.

It is an amenable number.

22214921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22214921 is an equidigital number, since it uses as much as digits as its factorization.

22214921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 576, while the sum is 23.

The square root of 22214921 is about 4713.2707327290. The cubic root of 22214921 is about 281.1134279479.

The spelling of 22214921 in words is "twenty-two million, two hundred fourteen thousand, nine hundred twenty-one".