21022220223 has 10 divisors (see below), whose sum is σ = 31403563664. Its totient is φ = 14014813428.

The previous prime is 21022220201. The next prime is 21022220257. The reversal of 21022220223 is 32202222012.

It is not a de Polignac number, because 21022220223 - 2⁶ = 21022220159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21022220196 and 21022220205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21022220423) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 129766711 + ... + 129766872.

Almost surely, 2^21022220223 is an apocalyptic number.

21022220223 is a deficient number, since it is larger than the sum of its proper divisors (10381343441).

21022220223 is an equidigital number, since it uses as much as digits as its factorization.

21022220223 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259533595 (or 259533586 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

Adding to 21022220223 its reverse (32202222012), we get a palindrome (53224442235).

The spelling of 21022220223 in words is "twenty-one billion, twenty-two million, two hundred twenty thousand, two hundred twenty-three".