423401221 has 2 divisors, whose sum is σ = 423401222. Its totient is φ = 423401220.

The previous prime is 423401197. The next prime is 423401233. The reversal of 423401221 is 122104324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 399440196 + 23961025 = 19986^2 + 4895^2 .

It is a cyclic number.

It is not a de Polignac number, because 423401221 - 2⁷ = 423401093 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423401281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211700610 + 211700611.

It is an arithmetic number, because the mean of its divisors is an integer number (211700611).

Almost surely, 2^423401221 is an apocalyptic number.

It is an amenable number.

423401221 is a deficient number, since it is larger than the sum of its proper divisors (1).

423401221 is an equidigital number, since it uses as much as digits as its factorization.

423401221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 423401221 is about 20576.7155056389. The cubic root of 423401221 is about 750.9033387945.

Adding to 423401221 its reverse (122104324), we get a palindrome (545505545).

The spelling of 423401221 in words is "four hundred twenty-three million, four hundred one thousand, two hundred twenty-one".