22319221 has 2 divisors, whose sum is σ = 22319222. Its totient is φ = 22319220.

The previous prime is 22319203. The next prime is 22319233. The reversal of 22319221 is 12291322.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21288996 + 1030225 = 4614^2 + 1015^2 .

It is a cyclic number.

It is not a de Polignac number, because 22319221 - 2⁵ = 22319189 is a prime.

It is a super-3 number, since 3×22319221³ (a number of 23 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 22319192 and 22319201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22314221) 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, 11159610 + 11159611.

It is an arithmetic number, because the mean of its divisors is an integer number (11159611).

Almost surely, 2^22319221 is an apocalyptic number.

It is an amenable number.

22319221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22319221 is an equidigital number, since it uses as much as digits as its factorization.

22319221 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 432, while the sum is 22.

The square root of 22319221 is about 4724.3222794386. The cubic root of 22319221 is about 281.5526877204.

The spelling of 22319221 in words is "twenty-two million, three hundred nineteen thousand, two hundred twenty-one".