3221431320 has 128 divisors (see below), whose sum is σ = 10258488000. Its totient is φ = 806486016.

The previous prime is 3221431261. The next prime is 3221431321. The reversal of 3221431320 is 231341223.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3221431321) 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, 914202 + ... + 917718.

Almost surely, 2^3221431320 is an apocalyptic number.

3221431320 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3221431320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5129244000).

3221431320 is an abundant number, since it is smaller than the sum of its proper divisors (7037056680).

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

3221431320 is a wasteful number, since it uses less digits than its factorization.

3221431320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3997 (or 3993 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 3221431320 is about 56757.6542855675. The cubic root of 3221431320 is about 1476.8950183054.

Adding to 3221431320 its reverse (231341223), we get a palindrome (3452772543).

The spelling of 3221431320 in words is "three billion, two hundred twenty-one million, four hundred thirty-one thousand, three hundred twenty".