100001221211 has 4 divisors (see below), whose sum is σ = 105264443400. Its totient is φ = 94737999024.

The previous prime is 100001221171. The next prime is 100001221223. The reversal of 100001221211 is 112122100001.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 100001221211 - 2⁶ = 100001221147 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100001221192 and 100001221201.

It is not an unprimeable number, because it can be changed into a prime (100001521211) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2631611066 + ... + 2631611103.

It is an arithmetic number, because the mean of its divisors is an integer number (26316110850).

Almost surely, 2^100001221211 is an apocalyptic number.

100001221211 is a deficient number, since it is larger than the sum of its proper divisors (5263222189).

100001221211 is an equidigital number, since it uses as much as digits as its factorization.

100001221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5263222188.

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

Adding to 100001221211 its reverse (112122100001), we get a palindrome (212123321212).

The spelling of 100001221211 in words is "one hundred billion, one million, two hundred twenty-one thousand, two hundred eleven".