221222099797 has 2 divisors, whose sum is σ = 221222099798. Its totient is φ = 221222099796.

The previous prime is 221222099741. The next prime is 221222099851. The reversal of 221222099797 is 797990222122.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 198594118321 + 22627981476 = 445639^2 + 150426^2 .

It is a cyclic number.

It is not a de Polignac number, because 221222099797 - 2⁷ = 221222099669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221222099717) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110611049898 + 110611049899.

It is an arithmetic number, because the mean of its divisors is an integer number (110611049899).

Almost surely, 2^221222099797 is an apocalyptic number.

It is an amenable number.

221222099797 is a deficient number, since it is larger than the sum of its proper divisors (1).

221222099797 is an equidigital number, since it uses as much as digits as its factorization.

221222099797 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1143072, while the sum is 52.

The spelling of 221222099797 in words is "two hundred twenty-one billion, two hundred twenty-two million, ninety-nine thousand, seven hundred ninety-seven".