1213311320 has 64 divisors (see below), whose sum is σ = 2945164320. Its totient is φ = 447197184.

The previous prime is 1213311317. The next prime is 1213311343. The reversal of 1213311320 is 231133121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 348227 + ... + 351693.

Almost surely, 2^1213311320 is an apocalyptic number.

1213311320 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 1213311320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1472582160).

1213311320 is an abundant number, since it is smaller than the sum of its proper divisors (1731853000).

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

1213311320 is a wasteful number, since it uses less digits than its factorization.

1213311320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4164 (or 4160 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 17.

The square root of 1213311320 is about 34832.6186210569. The cubic root of 1213311320 is about 1066.5734037382.

Adding to 1213311320 its reverse (231133121), we get a palindrome (1444444441).

The spelling of 1213311320 in words is "one billion, two hundred thirteen million, three hundred eleven thousand, three hundred twenty".