1211000122100 has 144 divisors (see below), whose sum is σ = 2891104332480. Its totient is φ = 438241843200.

The previous prime is 1211000122099. The next prime is 1211000122121. The reversal of 1211000122100 is 12210001121.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11136995 + ... + 11245205.

It is an arithmetic number, because the mean of its divisors is an integer number (20077113420).

Almost surely, 2^{1211000122100} is an apocalyptic number.

1211000122100 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 1211000122100, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1445552166240).

1211000122100 is an abundant number, since it is smaller than the sum of its proper divisors (1680104210380).

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

1211000122100 is a wasteful number, since it uses less digits than its factorization.

1211000122100 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108498 (or 108491 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 11.

Adding to 1211000122100 its reverse (12210001121), we get a palindrome (1223210123221).

The spelling of 1211000122100 in words is "one trillion, two hundred eleven billion, one hundred twenty-two thousand, one hundred".