22212991 has 2 divisors, whose sum is σ = 22212992. Its totient is φ = 22212990.

The previous prime is 22212959. The next prime is 22212997. The reversal of 22212991 is 19921222.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 22212991 - 2⁵ = 22212959 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (22212997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11106495 + 11106496.

It is an arithmetic number, because the mean of its divisors is an integer number (11106496).

Almost surely, 2^22212991 is an apocalyptic number.

22212991 is a deficient number, since it is larger than the sum of its proper divisors (1).

22212991 is an equidigital number, since it uses as much as digits as its factorization.

22212991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 28.

The square root of 22212991 is about 4713.0659872317. The cubic root of 22212991 is about 281.1052868037.

The spelling of 22212991 in words is "twenty-two million, two hundred twelve thousand, nine hundred ninety-one".