22391221 has 2 divisors, whose sum is σ = 22391222. Its totient is φ = 22391220.

The previous prime is 22391191. The next prime is 22391251. The reversal of 22391221 is 12219322.

It is a balanced prime because it is at equal distance from previous prime (22391191) and next prime (22391251).

It can be written as a sum of positive squares in only one way, i.e., 18447025 + 3944196 = 4295^2 + 1986^2 .

It is a cyclic number.

It is not a de Polignac number, because 22391221 - 2¹³ = 22383029 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 22391192 and 22391201.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22391251) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11195610 + 11195611.

It is an arithmetic number, because the mean of its divisors is an integer number (11195611).

Almost surely, 2^22391221 is an apocalyptic number.

It is an amenable number.

22391221 is a deficient number, since it is larger than the sum of its proper divisors (1).

22391221 is an equidigital number, since it uses as much as digits as its factorization.

22391221 is an evil number, because the sum of its binary digits is even.

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

The square root of 22391221 is about 4731.9362844400. The cubic root of 22391221 is about 281.8551181399.

The spelling of 22391221 in words is "twenty-two million, three hundred ninety-one thousand, two hundred twenty-one".