1213442133400 has 96 divisors (see below), whose sum is σ = 3225189155040. Its totient is φ = 415921167360.

The previous prime is 1213442133347. The next prime is 1213442133401. The reversal of 1213442133400 is 43312443121.

It is a happy number.

It is a super-2 number, since 2×1213442133400² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213442133401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4972644 + ... + 5210956.

It is an arithmetic number, because the mean of its divisors is an integer number (33595720365).

Almost surely, 2^{1213442133400} is an apocalyptic number.

1213442133400 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 1213442133400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1612594577520).

1213442133400 is an abundant number, since it is smaller than the sum of its proper divisors (2011747021640).

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

1213442133400 is a wasteful number, since it uses less digits than its factorization.

1213442133400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241973 (or 241964 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 28.

Adding to 1213442133400 its reverse (43312443121), we get a palindrome (1256754576521).

The spelling of 1213442133400 in words is "one trillion, two hundred thirteen billion, four hundred forty-two million, one hundred thirty-three thousand, four hundred".