1213123131320 has 32 divisors (see below), whose sum is σ = 2731162622400. Its totient is φ = 484958483328.

The previous prime is 1213123131317. The next prime is 1213123131343. The reversal of 1213123131320 is 231313213121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9018944 + ... + 9152463.

It is an arithmetic number, because the mean of its divisors is an integer number (85348831950).

Almost surely, 2^{1213123131320} is an apocalyptic number.

1213123131320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213123131320 is an abundant number, since it is smaller than the sum of its proper divisors (1518039491080).

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

1213123131320 is a wasteful number, since it uses less digits than its factorization.

1213123131320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18173087 (or 18173083 counting only the distinct ones).

The product of its (nonzero) digits is 648, while the sum is 23.

Adding to 1213123131320 its reverse (231313213121), we get a palindrome (1444436344441).

The spelling of 1213123131320 in words is "one trillion, two hundred thirteen billion, one hundred twenty-three million, one hundred thirty-one thousand, three hundred twenty".