221496823879 has 2 divisors, whose sum is σ = 221496823880. Its totient is φ = 221496823878.

The previous prime is 221496823859. The next prime is 221496823883. The reversal of 221496823879 is 978328694122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221496823879 - 2⁹ = 221496823367 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221496823859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110748411939 + 110748411940.

It is an arithmetic number, because the mean of its divisors is an integer number (110748411940).

Almost surely, 2^221496823879 is an apocalyptic number.

221496823879 is a deficient number, since it is larger than the sum of its proper divisors (1).

221496823879 is an equidigital number, since it uses as much as digits as its factorization.

221496823879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 20901888, while the sum is 61.

The spelling of 221496823879 in words is "two hundred twenty-one billion, four hundred ninety-six million, eight hundred twenty-three thousand, eight hundred seventy-nine".