3121220100 has 72 divisors (see below), whose sum is σ = 9274836928. Its totient is φ = 809827200.

The previous prime is 3121220087. The next prime is 3121220107. The reversal of 3121220100 is 10221213.

It is a Harshad number since it is a multiple of its sum of digits (12).

It is not an unprimeable number, because it can be changed into a prime (3121220107) 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, 129496 + ... + 151695.

Almost surely, 2^3121220100 is an apocalyptic number.

3121220100 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3121220100 is an abundant number, since it is smaller than the sum of its proper divisors (6153616828).

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

3121220100 is a wasteful number, since it uses less digits than its factorization.

3121220100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281245 (or 281238 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 12.

The square root of 3121220100 is about 55867.8807545087. The cubic root of 3121220100 is about 1461.4191648988.

Adding to 3121220100 its reverse (10221213), we get a palindrome (3131441313).

The spelling of 3121220100 in words is "three billion, one hundred twenty-one million, two hundred twenty thousand, one hundred".