21221200111101 has 4 divisors (see below), whose sum is σ = 28294933481472. Its totient is φ = 14147466740732.

The previous prime is 21221200111099. The next prime is 21221200111123. The reversal of 21221200111101 is 10111100212212.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21221200111101 - 2¹ = 21221200111099 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21221200111901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3536866685181 + ... + 3536866685186.

It is an arithmetic number, because the mean of its divisors is an integer number (7073733370368).

Almost surely, 2^{21221200111101} is an apocalyptic number.

It is an amenable number.

21221200111101 is a deficient number, since it is larger than the sum of its proper divisors (7073733370371).

21221200111101 is an equidigital number, since it uses as much as digits as its factorization.

21221200111101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7073733370370.

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

Adding to 21221200111101 its reverse (10111100212212), we get a palindrome (31332300323313).

The spelling of 21221200111101 in words is "twenty-one trillion, two hundred twenty-one billion, two hundred million, one hundred eleven thousand, one hundred one".