420222221 has 4 divisors (see below), whose sum is σ = 442339200. Its totient is φ = 398105244.

The previous prime is 420222211. The next prime is 420222241. The reversal of 420222221 is 122222024.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 420222221 - 2²² = 416027917 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 420222221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420222211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11058461 + ... + 11058498.

It is an arithmetic number, because the mean of its divisors is an integer number (110584800).

Almost surely, 2^420222221 is an apocalyptic number.

It is an amenable number.

420222221 is a deficient number, since it is larger than the sum of its proper divisors (22116979).

420222221 is a wasteful number, since it uses less digits than its factorization.

420222221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22116978.

The product of its (nonzero) digits is 256, while the sum is 17.

The square root of 420222221 is about 20499.3224522178. The cubic root of 420222221 is about 749.0192935863.

Adding to 420222221 its reverse (122222024), we get a palindrome (542444245).

The spelling of 420222221 in words is "four hundred twenty million, two hundred twenty-two thousand, two hundred twenty-one".