123378840122 has 4 divisors (see below), whose sum is σ = 185068260186. Its totient is φ = 61689420060.

The previous prime is 123378840113. The next prime is 123378840163. The reversal of 123378840122 is 221048873321.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 221048873321 = 277 ⋅798010373.

It can be written as a sum of positive squares in only one way, i.e., 85048640161 + 38330199961 = 291631^2 + 195781^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 123378840122.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 30844710029 + ... + 30844710032.

Almost surely, 2^123378840122 is an apocalyptic number.

123378840122 is a deficient number, since it is larger than the sum of its proper divisors (61689420064).

123378840122 is an equidigital number, since it uses as much as digits as its factorization.

123378840122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61689420063.

The product of its (nonzero) digits is 129024, while the sum is 41.

The spelling of 123378840122 in words is "one hundred twenty-three billion, three hundred seventy-eight million, eight hundred forty thousand, one hundred twenty-two".