21000001122223 has 4 divisors (see below), whose sum is σ = 21203884628368. Its totient is φ = 20796117616080.

The previous prime is 21000001122187. The next prime is 21000001122229. The reversal of 21000001122223 is 32222110000012.

It is a happy number.

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 21000001122223 - 2²⁵ = 20999967567791 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21000001122197 and 21000001122206.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21000001122229) 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, 101941752918 + ... + 101941753123.

It is an arithmetic number, because the mean of its divisors is an integer number (5300971157092).

Almost surely, 2^{21000001122223} is an apocalyptic number.

21000001122223 is a deficient number, since it is larger than the sum of its proper divisors (203883506145).

21000001122223 is a wasteful number, since it uses less digits than its factorization.

21000001122223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203883506144.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21000001122223 its reverse (32222110000012), we get a palindrome (53222111122235).

It can be divided in two parts, 2100000 and 1122223, that added together give a palindrome (3222223).

The spelling of 21000001122223 in words is "twenty-one trillion, one million, one hundred twenty-two thousand, two hundred twenty-three".