21120100211121 has 4 divisors (see below), whose sum is σ = 28160133614832. Its totient is φ = 14080066807412.

The previous prime is 21120100211069. The next prime is 21120100211137. The reversal of 21120100211121 is 12111200102112.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21120100211121 - 2²⁹ = 21119563340209 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21120100211121.

It is not an unprimeable number, because it can be changed into a prime (21120100211191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3520016701851 + ... + 3520016701856.

It is an arithmetic number, because the mean of its divisors is an integer number (7040033403708).

Almost surely, 2^{21120100211121} is an apocalyptic number.

It is an amenable number.

21120100211121 is a deficient number, since it is larger than the sum of its proper divisors (7040033403711).

21120100211121 is an equidigital number, since it uses as much as digits as its factorization.

21120100211121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7040033403710.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 21120100211121 its reverse (12111200102112), we get a palindrome (33231300313233).

The spelling of 21120100211121 in words is "twenty-one trillion, one hundred twenty billion, one hundred million, two hundred eleven thousand, one hundred twenty-one".