3121321300020 has 288 divisors, whose sum is σ = 12317500016640. Its totient is φ = 620386778880.

The previous prime is 3121321299989. The next prime is 3121321300057. The reversal of 3121321300020 is 200031231213.

3121321300020 is a `hidden beast` number, since 3 + 1 + 21 + 321 + 300 + 0 + 20 = 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 = 3121321299966 and 3121321300002.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 4576950 + ... + 5214509.

It is an arithmetic number, because the mean of its divisors is an integer number (42769097280).

Almost surely, 2^{3121321300020} is an apocalyptic number.

3121321300020 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

3121321300020 is an abundant number, since it is smaller than the sum of its proper divisors (9196178716620).

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

3121321300020 is a wasteful number, since it uses less digits than its factorization.

3121321300020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9791515 (or 9791510 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 18.

Adding to 3121321300020 its reverse (200031231213), we get a palindrome (3321352531233).

The spelling of 3121321300020 in words is "three trillion, one hundred twenty-one billion, three hundred twenty-one million, three hundred thousand, twenty".