420033221 has 2 divisors, whose sum is σ = 420033222. Its totient is φ = 420033220.

The previous prime is 420033191. The next prime is 420033259. The reversal of 420033221 is 122330024.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 409050625 + 10982596 = 20225^2 + 3314^2 .

It is a cyclic number.

It is not a de Polignac number, because 420033221 - 2⁶ = 420033157 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 420033221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (420033721) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210016610 + 210016611.

It is an arithmetic number, because the mean of its divisors is an integer number (210016611).

Almost surely, 2^420033221 is an apocalyptic number.

It is an amenable number.

420033221 is a deficient number, since it is larger than the sum of its proper divisors (1).

420033221 is an equidigital number, since it uses as much as digits as its factorization.

420033221 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 420033221 is about 20494.7120253006. The cubic root of 420033221 is about 748.9069832671.

Adding to 420033221 its reverse (122330024), we get a palindrome (542363245).

The spelling of 420033221 in words is "four hundred twenty million, thirty-three thousand, two hundred twenty-one".