3212131221 has 48 divisors (see below), whose sum is σ = 5201466816. Its totient is φ = 1969163136.

The previous prime is 3212131201. The next prime is 3212131259. The reversal of 3212131221 is 1221312123.

It is not a de Polignac number, because 3212131221 - 2⁵ = 3212131189 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 3212131194 and 3212131203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3212131201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 892201 + ... + 895793.

It is an arithmetic number, because the mean of its divisors is an integer number (108363892).

Almost surely, 2^3212131221 is an apocalyptic number.

It is an amenable number.

3212131221 is a deficient number, since it is larger than the sum of its proper divisors (1989335595).

3212131221 is a wasteful number, since it uses less digits than its factorization.

3212131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3904 (or 3892 counting only the distinct ones).

The product of its digits is 144, while the sum is 18.

The square root of 3212131221 is about 56675.6669215281. Note that the first 3 decimals coincide. The cubic root of 3212131221 is about 1475.4724095932.

Adding to 3212131221 its reverse (1221312123), we get a palindrome (4433443344).

The spelling of 3212131221 in words is "three billion, two hundred twelve million, one hundred thirty-one thousand, two hundred twenty-one".