221421251731171 has 2 divisors, whose sum is σ = 221421251731172. Its totient is φ = 221421251731170.

The previous prime is 221421251731157. The next prime is 221421251731193. The reversal of 221421251731171 is 171137152124122.

221421251731171 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221421251731171 - 2⁹ = 221421251730659 is a prime.

It is not a weakly prime, because it can be changed into another prime (221421251731871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110710625865585 + 110710625865586.

It is an arithmetic number, because the mean of its divisors is an integer number (110710625865586).

Almost surely, 2^{221421251731171} is an apocalyptic number.

221421251731171 is a deficient number, since it is larger than the sum of its proper divisors (1).

221421251731171 is an equidigital number, since it uses as much as digits as its factorization.

221421251731171 is an evil number, because the sum of its binary digits is even.

The product of its digits is 47040, while the sum is 40.

The spelling of 221421251731171 in words is "two hundred twenty-one trillion, four hundred twenty-one billion, two hundred fifty-one million, seven hundred thirty-one thousand, one hundred seventy-one".