921123923 has 4 divisors (see below), whose sum is σ = 931473720. Its totient is φ = 910774128.

The previous prime is 921123919. The next prime is 921123947. The reversal of 921123923 is 329321129.

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

It is a cyclic number.

It is not a de Polignac number, because 921123923 - 2² = 921123919 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 921123923.

It is not an unprimeable number, because it can be changed into a prime (921123023) 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, 5174765 + ... + 5174942.

It is an arithmetic number, because the mean of its divisors is an integer number (232868430).

Almost surely, 2^921123923 is an apocalyptic number.

921123923 is a deficient number, since it is larger than the sum of its proper divisors (10349797).

921123923 is a wasteful number, since it uses less digits than its factorization.

921123923 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10349796.

The product of its digits is 5832, while the sum is 32.

The square root of 921123923 is about 30350.0234431540. The cubic root of 921123923 is about 972.9847211886.

The spelling of 921123923 in words is "nine hundred twenty-one million, one hundred twenty-three thousand, nine hundred twenty-three".