3121023220 has 96 divisors (see below), whose sum is σ = 7963441920. Its totient is φ = 1003622400.

The previous prime is 3121023193. The next prime is 3121023229. The reversal of 3121023220 is 223201213.

It is a junction number, because it is equal to n+sod(n) for n = 3121023194 and 3121023203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3121023229) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 262852 + ... + 274468.

It is an arithmetic number, because the mean of its divisors is an integer number (82952520).

Almost surely, 2^3121023220 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 3121023220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3981720960).

3121023220 is an abundant number, since it is smaller than the sum of its proper divisors (4842418700).

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

3121023220 is a wasteful number, since it uses less digits than its factorization.

3121023220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11753 (or 11751 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 3121023220 is about 55866.1187125077. The cubic root of 3121023220 is about 1461.3884365035.

Adding to 3121023220 its reverse (223201213), we get a palindrome (3344224433).

The spelling of 3121023220 in words is "three billion, one hundred twenty-one million, twenty-three thousand, two hundred twenty".