123200299557721 has 2 divisors, whose sum is σ = 123200299557722. Its totient is φ = 123200299557720.

The previous prime is 123200299557701. The next prime is 123200299557761. The reversal of 123200299557721 is 127755992002321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 117527042498121 + 5673257059600 = 10840989^2 + 2381860^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123200299557721 is a prime.

It is a super-2 number, since 2×123200299557721² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (123200299557701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61600149778860 + 61600149778861.

It is an arithmetic number, because the mean of its divisors is an integer number (61600149778861).

Almost surely, 2^{123200299557721} is an apocalyptic number.

It is an amenable number.

123200299557721 is a deficient number, since it is larger than the sum of its proper divisors (1).

123200299557721 is an equidigital number, since it uses as much as digits as its factorization.

123200299557721 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4762800, while the sum is 55.

The spelling of 123200299557721 in words is "one hundred twenty-three trillion, two hundred billion, two hundred ninety-nine million, five hundred fifty-seven thousand, seven hundred twenty-one".