100121220121211 has 4 divisors (see below), whose sum is σ = 100359037746624. Its totient is φ = 99883402495800.

The previous prime is 100121220121199. The next prime is 100121220121229. The reversal of 100121220121211 is 112121022121001.

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 100121220121211 - 2³⁰ = 100120146379387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 100121220121211.

It is not an unprimeable number, because it can be changed into a prime (100121220181211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 118908812075 + ... + 118908812916.

It is an arithmetic number, because the mean of its divisors is an integer number (25089759436656).

Almost surely, 2^{100121220121211} is an apocalyptic number.

100121220121211 is a deficient number, since it is larger than the sum of its proper divisors (237817625413).

100121220121211 is an equidigital number, since it uses as much as digits as its factorization.

100121220121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 237817625412.

The product of its (nonzero) digits is 32, while the sum is 17.

Adding to 100121220121211 its reverse (112121022121001), we get a palindrome (212242242242212).

The spelling of 100121220121211 in words is "one hundred trillion, one hundred twenty-one billion, two hundred twenty million, one hundred twenty-one thousand, two hundred eleven".