420323221 has 2 divisors, whose sum is σ = 420323222. Its totient is φ = 420323220.

The previous prime is 420323207. The next prime is 420323251. The reversal of 420323221 is 122323024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 404211025 + 16112196 = 20105^2 + 4014^2 .

It is a cyclic number.

It is not a de Polignac number, because 420323221 - 2²³ = 411934613 is a prime.

It is a super-2 number, since 2×420323221² = 353343220223629682, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420323201) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210161610 + 210161611.

It is an arithmetic number, because the mean of its divisors is an integer number (210161611).

Almost surely, 2^420323221 is an apocalyptic number.

It is an amenable number.

420323221 is a deficient number, since it is larger than the sum of its proper divisors (1).

420323221 is an equidigital number, since it uses as much as digits as its factorization.

420323221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 420323221 is about 20501.7858002663. The cubic root of 420323221 is about 749.0792974642.

Adding to 420323221 its reverse (122323024), we get a palindrome (542646245).

The spelling of 420323221 in words is "four hundred twenty million, three hundred twenty-three thousand, two hundred twenty-one".