21100221020111 has 8 divisors (see below), whose sum is σ = 21336338361024. Its totient is φ = 20864970165760.

The previous prime is 21100221020083. The next prime is 21100221020257. The reversal of 21100221020111 is 11102012200112.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21100221020111 - 2¹⁴ = 21100221003727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21100221023111) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 216572666 + ... + 216670071.

It is an arithmetic number, because the mean of its divisors is an integer number (2667042295128).

Almost surely, 2^{21100221020111} is an apocalyptic number.

21100221020111 is a deficient number, since it is larger than the sum of its proper divisors (236117340913).

21100221020111 is a wasteful number, since it uses less digits than its factorization.

21100221020111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433243281.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 21100221020111 its reverse (11102012200112), we get a palindrome (32202233220223).

The spelling of 21100221020111 in words is "twenty-one trillion, one hundred billion, two hundred twenty-one million, twenty thousand, one hundred eleven".