213111121200 has 120 divisors (see below), whose sum is σ = 718595822400. Its totient is φ = 53838593280.

The previous prime is 213111121163. The next prime is 213111121211. The reversal of 213111121200 is 2121111312.

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a self number, because there is not a number n which added to its sum of digits gives 213111121200.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4650690 + ... + 4696289.

It is an arithmetic number, because the mean of its divisors is an integer number (5988298520).

Almost surely, 2^213111121200 is an apocalyptic number.

213111121200 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

213111121200 is an abundant number, since it is smaller than the sum of its proper divisors (505484701200).

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

213111121200 is a wasteful number, since it uses less digits than its factorization.

213111121200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9347019 (or 9347008 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 15.

Adding to 213111121200 its reverse (2121111312), we get a palindrome (215232232512).

The spelling of 213111121200 in words is "two hundred thirteen billion, one hundred eleven million, one hundred twenty-one thousand, two hundred".