21320220223 has 2 divisors, whose sum is σ = 21320220224. Its totient is φ = 21320220222.

The previous prime is 21320220197. The next prime is 21320220239. The reversal of 21320220223 is 32202202312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21320220223 - 2¹⁷ = 21320089151 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21320220223.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320220923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660110111 + 10660110112.

It is an arithmetic number, because the mean of its divisors is an integer number (10660110112).

Almost surely, 2^21320220223 is an apocalyptic number.

21320220223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320220223 is an equidigital number, since it uses as much as digits as its factorization.

21320220223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 576, while the sum is 19.

Adding to 21320220223 its reverse (32202202312), we get a palindrome (53522422535).

The spelling of 21320220223 in words is "twenty-one billion, three hundred twenty million, two hundred twenty thousand, two hundred twenty-three".