221421255265079 has 2 divisors, whose sum is σ = 221421255265080. Its totient is φ = 221421255265078.

The previous prime is 221421255265069. The next prime is 221421255265081. The reversal of 221421255265079 is 970562552124122.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221421255265079 - 2²⁴ = 221421238487863 is a prime.

Together with 221421255265081, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221421255265079.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221421255265069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710627632539 + 110710627632540.

It is an arithmetic number, because the mean of its divisors is an integer number (110710627632540).

Almost surely, 2^{221421255265079} is an apocalyptic number.

221421255265079 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421255265079 is an equidigital number, since it uses as much as digits as its factorization.

221421255265079 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6048000, while the sum is 53.

The spelling of 221421255265079 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-five million, two hundred sixty-five thousand, seventy-nine".