100121121211 has 4 divisors (see below), whose sum is σ = 100126116792. Its totient is φ = 100116125632.

The previous prime is 100121121193. The next prime is 100121121229. The reversal of 100121121211 is 112121121001.

It is a happy number.

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

It is an interprime number because it is at equal distance from previous prime (100121121193) and next prime (100121121229).

It is a cyclic number.

It is not a de Polignac number, because 100121121211 - 2⁹ = 100121120699 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 100121121191 and 100121121200.

It is not an unprimeable number, because it can be changed into a prime (100121121251) 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, 2467606 + ... + 2507851.

It is an arithmetic number, because the mean of its divisors is an integer number (25031529198).

Almost surely, 2^100121121211 is an apocalyptic number.

100121121211 is a deficient number, since it is larger than the sum of its proper divisors (4995581).

100121121211 is an equidigital number, since it uses as much as digits as its factorization.

100121121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4995580.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 100121121211 its reverse (112121121001), we get a palindrome (212242242212).

The spelling of 100121121211 in words is "one hundred billion, one hundred twenty-one million, one hundred twenty-one thousand, two hundred eleven".