1213534115400 has 384 divisors, whose sum is σ = 3992030208000. Its totient is φ = 304105052160.

The previous prime is 1213534115341. The next prime is 1213534115401. The reversal of 1213534115400 is 45114353121.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (1213534115401) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 852799089 + ... + 852800511.

It is an arithmetic number, because the mean of its divisors is an integer number (10395912000).

Almost surely, 2^{1213534115400} is an apocalyptic number.

1213534115400 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 1213534115400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1996015104000).

1213534115400 is an abundant number, since it is smaller than the sum of its proper divisors (2778496092600).

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

1213534115400 is a wasteful number, since it uses less digits than its factorization.

1213534115400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2013 (or 2004 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 30.

Adding to 1213534115400 its reverse (45114353121), we get a palindrome (1258648468521).

The spelling of 1213534115400 in words is "one trillion, two hundred thirteen billion, five hundred thirty-four million, one hundred fifteen thousand, four hundred".