3121133420 has 48 divisors (see below), whose sum is σ = 6923965440. Its totient is φ = 1178525376.

The previous prime is 3121133387. The next prime is 3121133429. The reversal of 3121133420 is 243311213.

3121133420 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 3121133392 and 3121133401.

It is not an unprimeable number, because it can be changed into a prime (3121133429) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 93029 + ... + 122051.

It is an arithmetic number, because the mean of its divisors is an integer number (144249280).

Almost surely, 2^3121133420 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 3121133420, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3461982720).

3121133420 is an abundant number, since it is smaller than the sum of its proper divisors (3802832020).

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

3121133420 is a wasteful number, since it uses less digits than its factorization.

3121133420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29334 (or 29332 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 20.

The square root of 3121133420 is about 55867.1049903250. The cubic root of 3121133420 is about 1461.4056363232.

Adding to 3121133420 its reverse (243311213), we get a palindrome (3364444633).

The spelling of 3121133420 in words is "three billion, one hundred twenty-one million, one hundred thirty-three thousand, four hundred twenty".