3121221400 has 96 divisors (see below), whose sum is σ = 7951834800. Its totient is φ = 1129932800.

The previous prime is 3121221379. The next prime is 3121221401. The reversal of 3121221400 is 41221213.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121221401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 509556 + ... + 515644.

Almost surely, 2^3121221400 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121221400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3975917400).

3121221400 is an abundant number, since it is smaller than the sum of its proper divisors (4830613400).

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

3121221400 is a wasteful number, since it uses less digits than its factorization.

3121221400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6349 (or 6340 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 3121221400 is about 55867.8923890995. The cubic root of 3121221400 is about 1461.4193677943.

Adding to 3121221400 its reverse (41221213), we get a palindrome (3162442613).

The spelling of 3121221400 in words is "three billion, one hundred twenty-one million, two hundred twenty-one thousand, four hundred".