3121311200220 has 144 divisors (see below), whose sum is σ = 9504428213280. Its totient is φ = 829148410368.

The previous prime is 3121311200219. The next prime is 3121311200323. The reversal of 3121311200220 is 220021131213.

3121311200220 is a `hidden beast` number, since 31 + 213 + 1 + 1 + 200 + 220 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 3121311200193 and 3121311200202.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 98844354 + ... + 98875926.

Almost surely, 2^{3121311200220} is an apocalyptic number.

3121311200220 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 3121311200220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4752214106640).

3121311200220 is an abundant number, since it is smaller than the sum of its proper divisors (6383117013060).

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

3121311200220 is a wasteful number, since it uses less digits than its factorization.

3121311200220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33684 (or 33679 counting only the distinct ones).

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

Adding to 3121311200220 its reverse (220021131213), we get a palindrome (3341332331433).

The spelling of 3121311200220 in words is "three trillion, one hundred twenty-one billion, three hundred eleven million, two hundred thousand, two hundred twenty".