421222212 has 36 divisors (see below), whose sum is σ = 1065467676. Its totient is φ = 140313600.

The previous prime is 421222189. The next prime is 421222213. The reversal of 421222212 is 212222124.

421222212 is a `hidden beast` number, since 421 + 22 + 221 + 2 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 391802436 + 29419776 = 19794^2 + 5424^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (421222213) 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, 69712 + ... + 75512.

Almost surely, 2^421222212 is an apocalyptic number.

It is an amenable number.

421222212 is an abundant number, since it is smaller than the sum of its proper divisors (644245464).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

421222212 is a wasteful number, since it uses less digits than its factorization.

421222212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7828 (or 7823 counting only the distinct ones).

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

The square root of 421222212 is about 20523.6987894483. The cubic root of 421222212 is about 749.6129629708.

Adding to 421222212 its reverse (212222124), we get a palindrome (633444336).

It can be divided in two parts, 4 and 21222212, that multiplied together give a palindrome (84888848).

The spelling of 421222212 in words is "four hundred twenty-one million, two hundred twenty-two thousand, two hundred twelve".