20100001221211 has 4 divisors (see below), whose sum is σ = 20100256852752. Its totient is φ = 20099745589672.

The previous prime is 20100001221203. The next prime is 20100001221269. The reversal of 20100001221211 is 11212210000102.

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 20100001221211 - 2³ = 20100001221203 is a prime.

It is a super-3 number, since 3×20100001221211³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20100001221191 and 20100001221200.

It is not an unprimeable number, because it can be changed into a prime (20100001221011) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 127697791 + ... + 127855096.

It is an arithmetic number, because the mean of its divisors is an integer number (5025064213188).

Almost surely, 2^{20100001221211} is an apocalyptic number.

20100001221211 is a deficient number, since it is larger than the sum of its proper divisors (255631541).

20100001221211 is an equidigital number, since it uses as much as digits as its factorization.

20100001221211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 255631540.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 20100001221211 its reverse (11212210000102), we get a palindrome (31312211221313).

The spelling of 20100001221211 in words is "twenty trillion, one hundred billion, one million, two hundred twenty-one thousand, two hundred eleven".