21022111223 has 4 divisors (see below), whose sum is σ = 21747011640. Its totient is φ = 20297210808.

The previous prime is 21022111217. The next prime is 21022111237. The reversal of 21022111223 is 32211122012.

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 21022111223 - 2⁴ = 21022111207 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 (21022111823) 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, 362450165 + ... + 362450222.

It is an arithmetic number, because the mean of its divisors is an integer number (5436752910).

Almost surely, 2^21022111223 is an apocalyptic number.

21022111223 is a deficient number, since it is larger than the sum of its proper divisors (724900417).

21022111223 is an equidigital number, since it uses as much as digits as its factorization.

21022111223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 724900416.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 21022111223 its reverse (32211122012), we get a palindrome (53233233235).

The spelling of 21022111223 in words is "twenty-one billion, twenty-two million, one hundred eleven thousand, two hundred twenty-three".