21022121221103 has 4 divisors (see below), whose sum is σ = 21062316482088. Its totient is φ = 20981925960120.

The previous prime is 21022121221081. The next prime is 21022121221151. The reversal of 21022121221103 is 30112212122012.

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 21022121221103 - 2²⁰ = 21022120172527 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 (21022121221403) 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, 20097629708 + ... + 20097630753.

It is an arithmetic number, because the mean of its divisors is an integer number (5265579120522).

Almost surely, 2^{21022121221103} is an apocalyptic number.

21022121221103 is a deficient number, since it is larger than the sum of its proper divisors (40195260985).

21022121221103 is an equidigital number, since it uses as much as digits as its factorization.

21022121221103 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40195260984.

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 21022121221103 its reverse (30112212122012), we get a palindrome (51134333343115).

Subtracting 21022121221103 from its reverse (30112212122012), we obtain a palindrome (9090090900909).

The spelling of 21022121221103 in words is "twenty-one trillion, twenty-two billion, one hundred twenty-one million, two hundred twenty-one thousand, one hundred three".