21120210210111 has 4 divisors (see below), whose sum is σ = 28160280280152. Its totient is φ = 14080140140072.

The previous prime is 21120210210061. The next prime is 21120210210181. The reversal of 21120210210111 is 11101201202112.

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 21120210210111 - 2⁷ = 21120210209983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21120210210181) 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, 3520035035016 + ... + 3520035035021.

It is an arithmetic number, because the mean of its divisors is an integer number (7040070070038).

Almost surely, 2^{21120210210111} is an apocalyptic number.

21120210210111 is a deficient number, since it is larger than the sum of its proper divisors (7040070070041).

21120210210111 is an equidigital number, since it uses as much as digits as its factorization.

21120210210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7040070070040.

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

Adding to 21120210210111 its reverse (11101201202112), we get a palindrome (32221411412223).

The spelling of 21120210210111 in words is "twenty-one trillion, one hundred twenty billion, two hundred ten million, two hundred ten thousand, one hundred eleven".