221734244725871 has 2 divisors, whose sum is σ = 221734244725872. Its totient is φ = 221734244725870.

The previous prime is 221734244725771. The next prime is 221734244725891. The reversal of 221734244725871 is 178527442437122.

221734244725871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 221734244725871 - 2³⁸ = 221459366818927 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 221734244725871.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221734244725891) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110867122362935 + 110867122362936.

It is an arithmetic number, because the mean of its divisors is an integer number (110867122362936).

Almost surely, 2^{221734244725871} is an apocalyptic number.

221734244725871 is a deficient number, since it is larger than the sum of its proper divisors (1).

221734244725871 is an equidigital number, since it uses as much as digits as its factorization.

221734244725871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 42147840, while the sum is 59.

The spelling of 221734244725871 in words is "two hundred twenty-one trillion, seven hundred thirty-four billion, two hundred forty-four million, seven hundred twenty-five thousand, eight hundred seventy-one".