22221817 has 2 divisors, whose sum is σ = 22221818. Its totient is φ = 22221816.

The previous prime is 22221799. The next prime is 22221833. The reversal of 22221817 is 71812222.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21939856 + 281961 = 4684^2 + 531^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-22221817 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22221791 and 22221800.

It is not a weakly prime, because it can be changed into another prime (22221847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11110908 + 11110909.

It is an arithmetic number, because the mean of its divisors is an integer number (11110909).

Almost surely, 2^22221817 is an apocalyptic number.

It is an amenable number.

22221817 is a deficient number, since it is larger than the sum of its proper divisors (1).

22221817 is an equidigital number, since it uses as much as digits as its factorization.

22221817 is an evil number, because the sum of its binary digits is even.

The product of its digits is 896, while the sum is 25.

The square root of 22221817 is about 4714.0022274072. The cubic root of 22221817 is about 281.1425128686.

The spelling of 22221817 in words is "twenty-two million, two hundred twenty-one thousand, eight hundred seventeen".