123220323291 has 12 divisors (see below), whose sum is σ = 177903899448. Its totient is φ = 75827890944.

The previous prime is 123220323269. The next prime is 123220323311. The reversal of 123220323291 is 192323022321.

It is a happy number.

It is not a de Polignac number, because 123220323291 - 2¹⁴ = 123220306907 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123220323221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 121518550 + ... + 121519563.

It is an arithmetic number, because the mean of its divisors is an integer number (14825324954).

Almost surely, 2^123220323291 is an apocalyptic number.

123220323291 is a deficient number, since it is larger than the sum of its proper divisors (54683576157).

123220323291 is a wasteful number, since it uses less digits than its factorization.

123220323291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 243038142 (or 243038129 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 30.

The spelling of 123220323291 in words is "one hundred twenty-three billion, two hundred twenty million, three hundred twenty-three thousand, two hundred ninety-one".