223704421 has 2 divisors, whose sum is σ = 223704422. Its totient is φ = 223704420.

The previous prime is 223704413. The next prime is 223704427. The reversal of 223704421 is 124407322.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 184579396 + 39125025 = 13586^2 + 6255^2 .

It is a cyclic number.

It is not a de Polignac number, because 223704421 - 2³ = 223704413 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (223704427) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 111852210 + 111852211.

It is an arithmetic number, because the mean of its divisors is an integer number (111852211).

Almost surely, 2^223704421 is an apocalyptic number.

It is an amenable number.

223704421 is a deficient number, since it is larger than the sum of its proper divisors (1).

223704421 is an equidigital number, since it uses as much as digits as its factorization.

223704421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2688, while the sum is 25.

The square root of 223704421 is about 14956.7516861115. The cubic root of 223704421 is about 607.0505482414.

The spelling of 223704421 in words is "two hundred twenty-three million, seven hundred four thousand, four hundred twenty-one".