123221520778711 has 2 divisors, whose sum is σ = 123221520778712. Its totient is φ = 123221520778710.

The previous prime is 123221520778709. The next prime is 123221520778729. The reversal of 123221520778711 is 117877025122321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 123221520778711 - 2¹ = 123221520778709 is a prime.

Together with 123221520778709, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123221520773711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61610760389355 + 61610760389356.

It is an arithmetic number, because the mean of its divisors is an integer number (61610760389356).

Almost surely, 2^{123221520778711} is an apocalyptic number.

123221520778711 is a deficient number, since it is larger than the sum of its proper divisors (1).

123221520778711 is an equidigital number, since it uses as much as digits as its factorization.

123221520778711 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 658560, while the sum is 49.

The spelling of 123221520778711 in words is "one hundred twenty-three trillion, two hundred twenty-one billion, five hundred twenty million, seven hundred seventy-eight thousand, seven hundred eleven".