21100223210111 has 4 divisors (see below), whose sum is σ = 21100283359512. Its totient is φ = 21100163060712.

The previous prime is 21100223210089. The next prime is 21100223210119. The reversal of 21100223210111 is 11101232200112.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21100223210111 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 21100223210111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100223210119) 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, 29545400 + ... + 30251133.

It is an arithmetic number, because the mean of its divisors is an integer number (5275070839878).

Almost surely, 2^{21100223210111} is an apocalyptic number.

21100223210111 is a deficient number, since it is larger than the sum of its proper divisors (60149401).

21100223210111 is an equidigital number, since it uses as much as digits as its factorization.

21100223210111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60149400.

The product of its (nonzero) digits is 48, while the sum is 17.

Adding to 21100223210111 its reverse (11101232200112), we get a palindrome (32201455410223).

The spelling of 21100223210111 in words is "twenty-one trillion, one hundred billion, two hundred twenty-three million, two hundred ten thousand, one hundred eleven".