1211020213200 has 240 divisors, whose sum is σ = 4465852798080. Its totient is φ = 274783887360.

The previous prime is 1211020213157. The next prime is 1211020213201. The reversal of 1211020213200 is 23120201121.

It is a tau number, because it is divible by the number of its divisors (240).

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 1211020213200.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211020213201) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 624636 + ... + 1676964.

It is an arithmetic number, because the mean of its divisors is an integer number (18607719992).

Almost surely, 2^{1211020213200} is an apocalyptic number.

1211020213200 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 1211020213200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2232926399040).

1211020213200 is an abundant number, since it is smaller than the sum of its proper divisors (3254832584880).

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

1211020213200 is a wasteful number, since it uses less digits than its factorization.

1211020213200 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052494 (or 1052483 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 15.

Adding to 1211020213200 its reverse (23120201121), we get a palindrome (1234140414321).

The spelling of 1211020213200 in words is "one trillion, two hundred eleven billion, twenty million, two hundred thirteen thousand, two hundred".