1213021120 has 112 divisors (see below), whose sum is σ = 3002158080. Its totient is φ = 466494464.

The previous prime is 1213021091. The next prime is 1213021157. The reversal of 1213021120 is 211203121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213021120.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 886677 + ... + 888043.

Almost surely, 2^1213021120 is an apocalyptic number.

1213021120 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 1213021120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1501079040).

1213021120 is an abundant number, since it is smaller than the sum of its proper divisors (1789136960).

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

1213021120 is a wasteful number, since it uses less digits than its factorization.

1213021120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1490 (or 1480 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 1213021120 is about 34828.4527362328. The cubic root of 1213021120 is about 1066.4883625574.

Adding to 1213021120 its reverse (211203121), we get a palindrome (1424224241).

The spelling of 1213021120 in words is "one billion, two hundred thirteen million, twenty-one thousand, one hundred twenty".