3121321221200 has 120 divisors (see below), whose sum is σ = 9229506857088. Its totient is φ = 987846704640.

The previous prime is 3121321221119. The next prime is 3121321221253. The reversal of 3121321221200 is 21221231213.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42838892 + ... + 42911691.

Almost surely, 2^{3121321221200} is an apocalyptic number.

It is an amenable number.

3121321221200 is an abundant number, since it is smaller than the sum of its proper divisors (6108185635888).

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

3121321221200 is a wasteful number, since it uses less digits than its factorization.

3121321221200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85750621 (or 85750610 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 3121321221200 its reverse (21221231213), we get a palindrome (3142542452413).

The spelling of 3121321221200 in words is "three trillion, one hundred twenty-one billion, three hundred twenty-one million, two hundred twenty-one thousand, two hundred".