420333221 has 24 divisors (see below), whose sum is σ = 551823840. Its totient is φ = 316226400.

The previous prime is 420333217. The next prime is 420333239. The reversal of 420333221 is 122333024.

It is not a de Polignac number, because 420333221 - 2² = 420333217 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420333193 and 420333202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420333241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2186 + ... + 29076.

It is an arithmetic number, because the mean of its divisors is an integer number (22992660).

Almost surely, 2^420333221 is an apocalyptic number.

It is an amenable number.

420333221 is a deficient number, since it is larger than the sum of its proper divisors (131490619).

420333221 is a wasteful number, since it uses less digits than its factorization.

420333221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26945 (or 26938 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 20.

The square root of 420333221 is about 20502.0296800097. The cubic root of 420333221 is about 749.0852379192.

Adding to 420333221 its reverse (122333024), we get a palindrome (542666245).

It can be divided in two parts, 42033 and 3221, that added together give a palindrome (45254).

The spelling of 420333221 in words is "four hundred twenty million, three hundred thirty-three thousand, two hundred twenty-one".