123768021 has 8 divisors (see below), whose sum is σ = 177718240. Its totient is φ = 76164912.

The previous prime is 123768011. The next prime is 123768059. The reversal of 123768021 is 120867321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123768021 - 2⁹ = 123767509 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 123768021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123768011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1586731 + ... + 1586808.

It is an arithmetic number, because the mean of its divisors is an integer number (22214780).

Almost surely, 2^123768021 is an apocalyptic number.

It is an amenable number.

123768021 is a deficient number, since it is larger than the sum of its proper divisors (53950219).

123768021 is a wasteful number, since it uses less digits than its factorization.

123768021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3173555.

The product of its (nonzero) digits is 4032, while the sum is 30.

The square root of 123768021 is about 11125.1076848721. The cubic root of 123768021 is about 498.3519350657.

The spelling of 123768021 in words is "one hundred twenty-three million, seven hundred sixty-eight thousand, twenty-one".