1211397120000 has 1400 divisors, whose sum is σ = 4756100760576. Its totient is φ = 306561024000.

The previous prime is 1211397119993. The next prime is 1211397120001. The reversal of 1211397120000 is 217931121.

It is a super-3 number, since 3×1211397120000³ (a number of 37 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (1211397120001) by changing a digit.

It is a polite number, since it can be written in 99 ways as a sum of consecutive naturals, for example, 9538559937 + ... + 9538560063.

Almost surely, 2^{1211397120000} is an apocalyptic number.

1211397120000 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 1211397120000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2378050380288).

1211397120000 is an abundant number, since it is smaller than the sum of its proper divisors (3544703640576).

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

1211397120000 is an frugal number, since it uses more digits than its factorization.

1211397120000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 160 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 27.

The spelling of 1211397120000 in words is "one trillion, two hundred eleven billion, three hundred ninety-seven million, one hundred twenty thousand".