1213212213100 has 144 divisors (see below), whose sum is σ = 2916066484800. Its totient is φ = 436032593920.

The previous prime is 1213212213061. The next prime is 1213212213113. The reversal of 1213212213100 is 13122123121.

It is a super-2 number, since 2×1213212213100² (a number of 25 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4249449 + ... + 4525951.

It is an arithmetic number, because the mean of its divisors is an integer number (20250461700).

Almost surely, 2^{1213212213100} is an apocalyptic number.

1213212213100 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 1213212213100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1458033242400).

1213212213100 is an abundant number, since it is smaller than the sum of its proper divisors (1702854271700).

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

1213212213100 is a wasteful number, since it uses less digits than its factorization.

1213212213100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 276652 (or 276645 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1213212213100 its reverse (13122123121), we get a palindrome (1226334336221).

The spelling of 1213212213100 in words is "one trillion, two hundred thirteen billion, two hundred twelve million, two hundred thirteen thousand, one hundred".