420031221 has 8 divisors (see below), whose sum is σ = 584391360. Its totient is φ = 267845952.

The previous prime is 420031193. The next prime is 420031231. The reversal of 420031221 is 122130024.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 420031221 - 2⁷ = 420031093 is a prime.

It is a super-2 number, since 2×420031221² = 352852453229501682, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 420031221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420031231) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3043636 + ... + 3043773.

It is an arithmetic number, because the mean of its divisors is an integer number (73048920).

Almost surely, 2^420031221 is an apocalyptic number.

It is an amenable number.

420031221 is a deficient number, since it is larger than the sum of its proper divisors (164360139).

420031221 is a wasteful number, since it uses less digits than its factorization.

420031221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6087435.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 420031221 is about 20494.6632321685. The cubic root of 420031221 is about 748.9057946180.

Adding to 420031221 its reverse (122130024), we get a palindrome (542161245).

The spelling of 420031221 in words is "four hundred twenty million, thirty-one thousand, two hundred twenty-one".