3121221213 has 24 divisors (see below), whose sum is σ = 4963427040. Its totient is φ = 1874288160.

The previous prime is 3121221209. The next prime is 3121221239.

3121221213 is nontrivially palindromic in base 10.

It is not a de Polignac number, because 3121221213 - 2² = 3121221209 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121221253) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 133831 + ... + 155412.

It is an arithmetic number, because the mean of its divisors is an integer number (206809460).

Almost surely, 2^3121221213 is an apocalyptic number.

3121221213 is a gapful number since it is divisible by the number (33) formed by its first and last digit.

It is an amenable number.

3121221213 is a deficient number, since it is larger than the sum of its proper divisors (1842205827).

3121221213 is a wasteful number, since it uses less digits than its factorization.

3121221213 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289369 (or 289366 counting only the distinct ones).

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

The square root of 3121221213 is about 55867.8907155085. The cubic root of 3121221213 is about 1461.4193386086.

It can be divided in two parts, 31212 and 21213, that added together give a palindrome (52425).

The spelling of 3121221213 in words is "three billion, one hundred twenty-one million, two hundred twenty-one thousand, two hundred thirteen".