421222221 has 32 divisors (see below), whose sum is σ = 714481920. Its totient is φ = 240259392.

The previous prime is 421222213. The next prime is 421222231. The reversal of 421222221 is 122222124.

421222221 is a `hidden beast` number, since 421 + 2 + 22 + 221 = 666.

It is not a de Polignac number, because 421222221 - 2³ = 421222213 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 421222194 and 421222203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421222231) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 121711 + ... + 125123.

It is an arithmetic number, because the mean of its divisors is an integer number (22327560).

Almost surely, 2^421222221 is an apocalyptic number.

It is an amenable number.

421222221 is a deficient number, since it is larger than the sum of its proper divisors (293259699).

421222221 is a wasteful number, since it uses less digits than its factorization.

421222221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4082 (or 4076 counting only the distinct ones).

The product of its digits is 256, while the sum is 18.

The square root of 421222221 is about 20523.6990087070. The cubic root of 421222221 is about 749.6129683096.

Adding to 421222221 its reverse (122222124), we get a palindrome (543444345).

The spelling of 421222221 in words is "four hundred twenty-one million, two hundred twenty-two thousand, two hundred twenty-one".