21112220323 has 4 divisors (see below), whose sum is σ = 21627152568. Its totient is φ = 20597288080.

The previous prime is 21112220293. The next prime is 21112220341. The reversal of 21112220323 is 32302221112.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 21112220323 - 2²⁹ = 20575349411 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21112220323.

It is not an unprimeable number, because it can be changed into a prime (21112221323) 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, 257466061 + ... + 257466142.

It is an arithmetic number, because the mean of its divisors is an integer number (5406788142).

Almost surely, 2^21112220323 is an apocalyptic number.

21112220323 is a deficient number, since it is larger than the sum of its proper divisors (514932245).

21112220323 is an equidigital number, since it uses as much as digits as its factorization.

21112220323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 514932244.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 21112220323 its reverse (32302221112), we get a palindrome (53414441435).

The spelling of 21112220323 in words is "twenty-one billion, one hundred twelve million, two hundred twenty thousand, three hundred twenty-three".