3133131221 has 16 divisors (see below), whose sum is σ = 3481686720. Its totient is φ = 2795358720.

The previous prime is 3133131191. The next prime is 3133131259. The reversal of 3133131221 is 1221313313.

It is a de Polignac number, because none of the positive numbers 2^k-3133131221 is a prime.

It is a super-2 number, since 2×3133131221² = 19633022496009901682, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3133131193 and 3133131202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3133131271) 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, 420101 + ... + 427493.

It is an arithmetic number, because the mean of its divisors is an integer number (217605420).

Almost surely, 2^3133131221 is an apocalyptic number.

It is an amenable number.

3133131221 is a deficient number, since it is larger than the sum of its proper divisors (348555499).

3133131221 is a wasteful number, since it uses less digits than its factorization.

3133131221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8116.

The product of its digits is 324, while the sum is 20.

The square root of 3133131221 is about 55974.3800412296. The cubic root of 3133131221 is about 1463.2758153835.

Adding to 3133131221 its reverse (1221313313), we get a palindrome (4354444534).

The spelling of 3133131221 in words is "three billion, one hundred thirty-three million, one hundred thirty-one thousand, two hundred twenty-one".