22619921 has 2 divisors, whose sum is σ = 22619922. Its totient is φ = 22619920.

The previous prime is 22619903. The next prime is 22619929. The reversal of 22619921 is 12991622.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21022225 + 1597696 = 4585^2 + 1264^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22619921 is a prime.

It is not a weakly prime, because it can be changed into another prime (22619929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11309960 + 11309961.

It is an arithmetic number, because the mean of its divisors is an integer number (11309961).

Almost surely, 2^22619921 is an apocalyptic number.

It is an amenable number.

22619921 is a deficient number, since it is larger than the sum of its proper divisors (1).

22619921 is an equidigital number, since it uses as much as digits as its factorization.

22619921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3888, while the sum is 32.

The square root of 22619921 is about 4756.0404750170. The cubic root of 22619921 is about 282.8114757001.

The spelling of 22619921 in words is "twenty-two million, six hundred nineteen thousand, nine hundred twenty-one".