3231212220 has 72 divisors (see below), whose sum is σ = 10066265664. Its totient is φ = 838366848.

The previous prime is 3231212197. The next prime is 3231212227. The reversal of 3231212220 is 222121323.

3231212220 is a `hidden beast` number, since 3 + 231 + 212 + 220 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 3231212193 and 3231212202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3231212227) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235924 + ... + 249243.

Almost surely, 2^3231212220 is an apocalyptic number.

3231212220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3231212220 is an abundant number, since it is smaller than the sum of its proper divisors (6835053444).

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

3231212220 is a wasteful number, since it uses less digits than its factorization.

3231212220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 485219 (or 485214 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 3231212220 is about 56843.7526910390. The cubic root of 3231212220 is about 1478.3882228271.

Adding to 3231212220 its reverse (222121323), we get a palindrome (3453333543).

The spelling of 3231212220 in words is "three billion, two hundred thirty-one million, two hundred twelve thousand, two hundred twenty".