1213531523340 has 48 divisors (see below), whose sum is σ = 3397939974240. Its totient is φ = 323603481600.

The previous prime is 1213531523329. The next prime is 1213531523353. The reversal of 1213531523340 is 433251353121.

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, 5598990 + ... + 5811690.

It is an arithmetic number, because the mean of its divisors is an integer number (70790416130).

Almost surely, 2^{1213531523340} is an apocalyptic number.

1213531523340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1213531523340 is an abundant number, since it is smaller than the sum of its proper divisors (2184408450900).

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

1213531523340 is a wasteful number, since it uses less digits than its factorization.

1213531523340 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 307802 (or 307800 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 33.

Adding to 1213531523340 its reverse (433251353121), we get a palindrome (1646782876461).

The spelling of 1213531523340 in words is "one trillion, two hundred thirteen billion, five hundred thirty-one million, five hundred twenty-three thousand, three hundred forty".