21110000121211 has 4 divisors (see below), whose sum is σ = 21600930356632. Its totient is φ = 20619069885792.

The previous prime is 21110000121179. The next prime is 21110000121233. The reversal of 21110000121211 is 11212100001112.

It is a happy number.

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 21110000121211 - 2⁵ = 21110000121179 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21110000121191 and 21110000121200.

It is not an unprimeable number, because it can be changed into a prime (21110000121251) 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, 245465117646 + ... + 245465117731.

It is an arithmetic number, because the mean of its divisors is an integer number (5400232589158).

Almost surely, 2^{21110000121211} is an apocalyptic number.

21110000121211 is a deficient number, since it is larger than the sum of its proper divisors (490930235421).

21110000121211 is an equidigital number, since it uses as much as digits as its factorization.

21110000121211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 490930235420.

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

Adding to 21110000121211 its reverse (11212100001112), we get a palindrome (32322100122323).

The spelling of 21110000121211 in words is "twenty-one trillion, one hundred ten billion, one hundred twenty-one thousand, two hundred eleven".