1211320023200 has 216 divisors, whose sum is σ = 3441382292124. Its totient is φ = 415134720000.

The previous prime is 1211320023191. The next prime is 1211320023211. The reversal of 1211320023200 is 23200231121.

It can be written as a sum of positive squares in 6 ways, for example, as 336878089744 + 874441933456 = 580412^2 + 935116^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 122338250 + ... + 122348150.

Almost surely, 2^{1211320023200} is an apocalyptic number.

1211320023200 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 1211320023200, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1720691146062).

1211320023200 is an abundant number, since it is smaller than the sum of its proper divisors (2230062268924).

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

1211320023200 is a wasteful number, since it uses less digits than its factorization.

1211320023200 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13056 (or 13036 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 1211320023200 its reverse (23200231121), we get a palindrome (1234520254321).

The spelling of 1211320023200 in words is "one trillion, two hundred eleven billion, three hundred twenty million, twenty-three thousand, two hundred".