421520233 has 2 divisors, whose sum is σ = 421520234. Its totient is φ = 421520232.

The previous prime is 421520207. The next prime is 421520269. The reversal of 421520233 is 332025124.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 236913664 + 184606569 = 15392^2 + 13587^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-421520233 is a prime.

It is not a weakly prime, because it can be changed into another prime (421520273) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210760116 + 210760117.

It is an arithmetic number, because the mean of its divisors is an integer number (210760117).

Almost surely, 2^421520233 is an apocalyptic number.

It is an amenable number.

421520233 is a deficient number, since it is larger than the sum of its proper divisors (1).

421520233 is an equidigital number, since it uses as much as digits as its factorization.

421520233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1440, while the sum is 22.

The square root of 421520233 is about 20530.9579172527. The cubic root of 421520233 is about 749.7897087460.

Adding to 421520233 its reverse (332025124), we get a palindrome (753545357).

The spelling of 421520233 in words is "four hundred twenty-one million, five hundred twenty thousand, two hundred thirty-three".