1213111313204 has 96 divisors (see below), whose sum is σ = 2576520576000. Its totient is φ = 487880640000.

The previous prime is 1213111313173. The next prime is 1213111313209. The reversal of 1213111313204 is 4023131113121.

It is a self number, because there is not a number n which added to its sum of digits gives 1213111313204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213111313209) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 373148579 + ... + 373151829.

It is an arithmetic number, because the mean of its divisors is an integer number (26838756000).

Almost surely, 2^{1213111313204} is an apocalyptic number.

1213111313204 is a gapful number since it is divisible by the number (14) 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 1213111313204, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1288260288000).

1213111313204 is an abundant number, since it is smaller than the sum of its proper divisors (1363409262796).

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

1213111313204 is a wasteful number, since it uses less digits than its factorization.

1213111313204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5349 (or 5347 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

Adding to 1213111313204 its reverse (4023131113121), we get a palindrome (5236242426325).

The spelling of 1213111313204 in words is "one trillion, two hundred thirteen billion, one hundred eleven million, three hundred thirteen thousand, two hundred four".