431221212 has 48 divisors (see below), whose sum is σ = 1119904800. Its totient is φ = 143493120.

The previous prime is 431221211. The next prime is 431221223. The reversal of 431221212 is 212122134.

It is a happy number.

431221212 is a `hidden beast` number, since 431 + 2 + 21 + 212 = 666.

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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (431221211) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 66114 + ... + 72342.

It is an arithmetic number, because the mean of its divisors is an integer number (23331350).

Almost surely, 2^431221212 is an apocalyptic number.

It is an amenable number.

431221212 is an abundant number, since it is smaller than the sum of its proper divisors (688683588).

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

431221212 is a wasteful number, since it uses less digits than its factorization.

431221212 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6883 (or 6875 counting only the distinct ones).

The product of its digits is 192, while the sum is 18.

The square root of 431221212 is about 20765.8665121396. The cubic root of 431221212 is about 755.4980921535.

Adding to 431221212 its reverse (212122134), we get a palindrome (643343346).

The spelling of 431221212 in words is "four hundred thirty-one million, two hundred twenty-one thousand, two hundred twelve".