1212201100000 has 144 divisors (see below), whose sum is σ = 3254141377872. Its totient is φ = 440800000000.

The previous prime is 1212201099971. The next prime is 1212201100013. The reversal of 1212201100000 is 11022121.

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a self number, because there is not a number n which added to its sum of digits gives 1212201100000.

It is a congruent number.

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, 549000 + ... + 1651000.

It is an arithmetic number, because the mean of its divisors is an integer number (22598204013).

Almost surely, 2^{1212201100000} is an apocalyptic number.

1212201100000 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 1212201100000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1627070688936).

1212201100000 is an abundant number, since it is smaller than the sum of its proper divisors (2041940277872).

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

1212201100000 is an equidigital number, since it uses as much as digits as its factorization.

1212201100000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102047 (or 1102019 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1212201100000 its reverse (11022121), we get a palindrome (1212212122121).

The spelling of 1212201100000 in words is "one trillion, two hundred twelve billion, two hundred one million, one hundred thousand".