223123921 has 2 divisors, whose sum is σ = 223123922. Its totient is φ = 223123920.

The previous prime is 223123913. The next prime is 223123931. The reversal of 223123921 is 129321322.

223123921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 223054225 + 69696 = 14935^2 + 264^2 .

It is a cyclic number.

It is not a de Polignac number, because 223123921 - 2³ = 223123913 is a prime.

It is a super-3 number, since 3×223123921³ (a number of 26 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (223123931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111561960 + 111561961.

It is an arithmetic number, because the mean of its divisors is an integer number (111561961).

Almost surely, 2^223123921 is an apocalyptic number.

It is an amenable number.

223123921 is a deficient number, since it is larger than the sum of its proper divisors (1).

223123921 is an equidigital number, since it uses as much as digits as its factorization.

223123921 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1296, while the sum is 25.

The square root of 223123921 is about 14937.3331287750. Note that the first 3 decimals coincide. The cubic root of 223123921 is about 606.5250064053.

The spelling of 223123921 in words is "two hundred twenty-three million, one hundred twenty-three thousand, nine hundred twenty-one".