3121203712 has 120 divisors (see below), whose sum is σ = 6948805248. Its totient is φ = 1399326720.

The previous prime is 3121203703. The next prime is 3121203713. The reversal of 3121203712 is 2173021213.

It is a happy number.

It is a super-2 number, since 2×3121203712² = 19483825223605157888, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (3121203713) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5141713 + ... + 5142319.

Almost surely, 2^3121203712 is an apocalyptic number.

3121203712 is a gapful number since it is divisible by the number (32) 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 3121203712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3474402624).

3121203712 is an abundant number, since it is smaller than the sum of its proper divisors (3827601536).

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

3121203712 is an equidigital number, since it uses as much as digits as its factorization.

3121203712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 730 (or 703 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 3121203712 is about 55867.7340868591. The cubic root of 3121203712 is about 1461.4166071619.

Adding to 3121203712 its reverse (2173021213), we get a palindrome (5294224925).

The spelling of 3121203712 in words is "three billion, one hundred twenty-one million, two hundred three thousand, seven hundred twelve".