420322221 has 12 divisors (see below), whose sum is σ = 662326080. Its totient is φ = 254740680.

The previous prime is 420322187. The next prime is 420322249. The reversal of 420322221 is 122223024.

420322221 is a `hidden beast` number, since 420 + 3 + 22 + 221 = 666.

It is not a de Polignac number, because 420322221 - 2¹⁰ = 420321197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 420322194 and 420322203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420320221) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2122741 + ... + 2122938.

It is an arithmetic number, because the mean of its divisors is an integer number (55193840).

Almost surely, 2^420322221 is an apocalyptic number.

It is an amenable number.

420322221 is a deficient number, since it is larger than the sum of its proper divisors (242003859).

420322221 is a wasteful number, since it uses less digits than its factorization.

420322221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4245696 (or 4245693 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 420322221 is about 20501.7614121324. The cubic root of 420322221 is about 749.0787034135.

Adding to 420322221 its reverse (122223024), we get a palindrome (542545245).

It can be divided in two parts, 42032 and 2221, that added together give a triangular number (44253 = T₂₉₇).

The spelling of 420322221 in words is "four hundred twenty million, three hundred twenty-two thousand, two hundred twenty-one".