123007921 has 4 divisors (see below), whose sum is σ = 123260992. Its totient is φ = 122754852.

The previous prime is 123007901. The next prime is 123007987. The reversal of 123007921 is 129700321.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 123007921 - 2⁵ = 123007889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (123007901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125805 + ... + 126778.

It is an arithmetic number, because the mean of its divisors is an integer number (30815248).

Almost surely, 2^123007921 is an apocalyptic number.

It is an amenable number.

123007921 is a deficient number, since it is larger than the sum of its proper divisors (253071).

123007921 is an equidigital number, since it uses as much as digits as its factorization.

123007921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253070.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 123007921 is about 11090.8936069191. The cubic root of 123007921 is about 497.3296586090.

The spelling of 123007921 in words is "one hundred twenty-three million, seven thousand, nine hundred twenty-one".