1331002120 has 64 divisors (see below), whose sum is σ = 3461097600. Its totient is φ = 451207680.

The previous prime is 1331002109. The next prime is 1331002121. The reversal of 1331002120 is 212001331.

It is a self number, because there is not a number n which added to its sum of digits gives 1331002120.

It is not an unprimeable number, because it can be changed into a prime (1331002121) 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, 1786 + ... + 51625.

It is an arithmetic number, because the mean of its divisors is an integer number (54079650).

Almost surely, 2^1331002120 is an apocalyptic number.

1331002120 is a gapful number since it is divisible by the number (10) 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 1331002120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1730548800).

1331002120 is an abundant number, since it is smaller than the sum of its proper divisors (2130095480).

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

1331002120 is a wasteful number, since it uses less digits than its factorization.

1331002120 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53518 (or 53514 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 13.

The square root of 1331002120 is about 36482.9017486274. The cubic root of 1331002120 is about 1100.0005840217. Note that the first 3 decimals are identical.

Adding to 1331002120 its reverse (212001331), we get a palindrome (1543003451).

The spelling of 1331002120 in words is "one billion, three hundred thirty-one million, two thousand, one hundred twenty".