21200221100111 has 4 divisors (see below), whose sum is σ = 21693249497832. Its totient is φ = 20707192702392.

The previous prime is 21200221100101. The next prime is 21200221100231. The reversal of 21200221100111 is 11100112200212.

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 21200221100111 - 2⁴² = 16802174589007 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 (21200221100101) 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, 246514198796 + ... + 246514198881.

It is an arithmetic number, because the mean of its divisors is an integer number (5423312374458).

Almost surely, 2^{21200221100111} is an apocalyptic number.

21200221100111 is a deficient number, since it is larger than the sum of its proper divisors (493028397721).

21200221100111 is an equidigital number, since it uses as much as digits as its factorization.

21200221100111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 493028397720.

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

Adding to 21200221100111 its reverse (11100112200212), we get a palindrome (32300333300323).

The spelling of 21200221100111 in words is "twenty-one trillion, two hundred billion, two hundred twenty-one million, one hundred thousand, one hundred eleven".