1211211201012 has 96 divisors (see below), whose sum is σ = 2985204969600. Its totient is φ = 381164838912.

The previous prime is 1211211200989. The next prime is 1211211201023. The reversal of 1211211201012 is 2101021121121.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 1211211200982 and 1211211201000.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 163298328 + ... + 163305744.

It is an arithmetic number, because the mean of its divisors is an integer number (31095885100).

Almost surely, 2^{1211211201012} is an apocalyptic number.

1211211201012 is a gapful number since it is divisible by the number (12) 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 1211211201012, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1492602484800).

1211211201012 is an abundant number, since it is smaller than the sum of its proper divisors (1773993768588).

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

1211211201012 is a wasteful number, since it uses less digits than its factorization.

1211211201012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9825 (or 9823 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 1211211201012 its reverse (2101021121121), we get a palindrome (3312232322133).

The spelling of 1211211201012 in words is "one trillion, two hundred eleven billion, two hundred eleven million, two hundred one thousand, twelve".