3121002020 has 24 divisors (see below), whose sum is σ = 6839066304. Its totient is φ = 1194122336.

The previous prime is 3121001999. The next prime is 3121002023. The reversal of 3121002020 is 202001213.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 3121001992 and 3121002010.

It is not an unprimeable number, because it can be changed into a prime (3121002023) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3391934 + ... + 3392853.

It is an arithmetic number, because the mean of its divisors is an integer number (284961096).

Almost surely, 2^3121002020 is an apocalyptic number.

It is an amenable number.

3121002020 is an abundant number, since it is smaller than the sum of its proper divisors (3718064284).

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

3121002020 is a wasteful number, since it uses less digits than its factorization.

3121002020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6784819 (or 6784817 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 11.

The square root of 3121002020 is about 55865.9289728543. The cubic root of 3121002020 is about 1461.3851275988.

Adding to 3121002020 its reverse (202001213), we get a palindrome (3323003233).

The spelling of 3121002020 in words is "three billion, one hundred twenty-one million, two thousand, twenty".