1311022011320 has 64 divisors (see below), whose sum is σ = 3426465067200. Its totient is φ = 442124513280.

The previous prime is 1311022011319. The next prime is 1311022011323. The reversal of 1311022011320 is 231102201131.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1311022011323) 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, 38361785 + ... + 38395944.

It is an arithmetic number, because the mean of its divisors is an integer number (53538516675).

Almost surely, 2^{1311022011320} is an apocalyptic number.

1311022011320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1311022011320 is an abundant number, since it is smaller than the sum of its proper divisors (2115443055880).

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

1311022011320 is a wasteful number, since it uses less digits than its factorization.

1311022011320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76757808 (or 76757804 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 17.

Adding to 1311022011320 its reverse (231102201131), we get a palindrome (1542124212451).

The spelling of 1311022011320 in words is "one trillion, three hundred eleven billion, twenty-two million, eleven thousand, three hundred twenty".