1211011200000 has 792 divisors, whose sum is σ = 4995895492224. Its totient is φ = 276756480000.

The previous prime is 1211011199939. The next prime is 1211011200073. The reversal of 1211011200000 is 21101121.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a super Niven number, because it is divisible the sum of any subset of its (nonzero) digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 201596997 + ... + 201603003.

Almost surely, 2^{1211011200000} is an apocalyptic number.

1211011200000 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 1211011200000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2497947746112).

1211011200000 is an abundant number, since it is smaller than the sum of its proper divisors (3784884292224).

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

1211011200000 is an frugal number, since it uses more digits than its factorization.

1211011200000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6065 (or 6024 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1211011200000 its reverse (21101121), we get a palindrome (1211032301121).

The spelling of 1211011200000 in words is "one trillion, two hundred eleven billion, eleven million, two hundred thousand".