123404402122 has 4 divisors (see below), whose sum is σ = 185106603186. Its totient is φ = 61702201060.

The previous prime is 123404402057. The next prime is 123404402123. The reversal of 123404402122 is 221204404321.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 114798314761 + 8606087361 = 338819^2 + 92769^2 .

It is not an unprimeable number, because it can be changed into a prime (123404402123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30851100529 + ... + 30851100532.

Almost surely, 2^123404402122 is an apocalyptic number.

123404402122 is a deficient number, since it is larger than the sum of its proper divisors (61702201064).

123404402122 is an equidigital number, since it uses as much as digits as its factorization.

123404402122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61702201063.

The product of its (nonzero) digits is 3072, while the sum is 25.

Adding to 123404402122 its reverse (221204404321), we get a palindrome (344608806443).

The spelling of 123404402122 in words is "one hundred twenty-three billion, four hundred four million, four hundred two thousand, one hundred twenty-two".