221222323991 has 2 divisors, whose sum is σ = 221222323992. Its totient is φ = 221222323990.

The previous prime is 221222323967. The next prime is 221222324077. The reversal of 221222323991 is 199323222122.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221222323991 - 2²² = 221218129687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221221323991) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611161995 + 110611161996.

It is an arithmetic number, because the mean of its divisors is an integer number (110611161996).

Almost surely, 2^221222323991 is an apocalyptic number.

221222323991 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222323991 is an equidigital number, since it uses as much as digits as its factorization.

221222323991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 38.

The spelling of 221222323991 in words is "two hundred twenty-one billion, two hundred twenty-two million, three hundred twenty-three thousand, nine hundred ninety-one".