3121321012 has 6 divisors (see below), whose sum is σ = 5462311778. Its totient is φ = 1560660504.

The previous prime is 3121321001. The next prime is 3121321013. The reversal of 3121321012 is 2101231213.

It can be written as a sum of positive squares in only one way, i.e., 2717953956 + 403367056 = 52134^2 + 20084^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121321013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 390165123 + ... + 390165130.

Almost surely, 2^3121321012 is an apocalyptic number.

It is an amenable number.

3121321012 is a deficient number, since it is larger than the sum of its proper divisors (2340990766).

3121321012 is a wasteful number, since it uses less digits than its factorization.

3121321012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 780330257 (or 780330255 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

The square root of 3121321012 is about 55868.7838779403. The cubic root of 3121321012 is about 1461.4349144173.

Adding to 3121321012 its reverse (2101231213), we get a palindrome (5222552225).

It can be divided in two parts, 31213 and 21012, that added together give a palindrome (52225).

The spelling of 3121321012 in words is "three billion, one hundred twenty-one million, three hundred twenty-one thousand, twelve".