123266721 has 16 divisors (see below), whose sum is σ = 171186048. Its totient is φ = 78825600.

The previous prime is 123266713. The next prime is 123266723. The reversal of 123266721 is 127662321.

It is not a de Polignac number, because 123266721 - 2³ = 123266713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (123266723) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 61 + ... + 15701.

It is an arithmetic number, because the mean of its divisors is an integer number (10699128).

Almost surely, 2^123266721 is an apocalyptic number.

It is an amenable number.

123266721 is a deficient number, since it is larger than the sum of its proper divisors (47919327).

123266721 is a wasteful number, since it uses less digits than its factorization.

123266721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15752.

The product of its digits is 6048, while the sum is 30.

The square root of 123266721 is about 11102.5547060125. The cubic root of 123266721 is about 497.6781964786.

The spelling of 123266721 in words is "one hundred twenty-three million, two hundred sixty-six thousand, seven hundred twenty-one".