21200111022021 has 8 divisors (see below), whose sum is σ = 28285016128320. Its totient is φ = 14124306631872.

The previous prime is 21200111022019. The next prime is 21200111022037. The reversal of 21200111022021 is 12022011100212.

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

It is not a de Polignac number, because 21200111022021 - 2¹ = 21200111022019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21200111022011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2275173601 + ... + 2275182918.

It is an arithmetic number, because the mean of its divisors is an integer number (3535627016040).

Almost surely, 2^{21200111022021} is an apocalyptic number.

It is an amenable number.

21200111022021 is a deficient number, since it is larger than the sum of its proper divisors (7084905106299).

21200111022021 is a wasteful number, since it uses less digits than its factorization.

21200111022021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4550358075.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 21200111022021 its reverse (12022011100212), we get a palindrome (33222122122233).

The spelling of 21200111022021 in words is "twenty-one trillion, two hundred billion, one hundred eleven million, twenty-two thousand, twenty-one".