21320232223 has 2 divisors, whose sum is σ = 21320232224. Its totient is φ = 21320232222.

The previous prime is 21320232181. The next prime is 21320232229. The reversal of 21320232223 is 32223202312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21320232223 - 2³³ = 12730297631 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21320232194 and 21320232203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21320232229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660116111 + 10660116112.

It is an arithmetic number, because the mean of its divisors is an integer number (10660116112).

Almost surely, 2^21320232223 is an apocalyptic number.

21320232223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320232223 is an equidigital number, since it uses as much as digits as its factorization.

21320232223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 22.

Adding to 21320232223 its reverse (32223202312), we get a palindrome (53543434535).

It can be divided in two parts, 2 and 1320232223, that added together give a square (1320232225 = 36335²).

The spelling of 21320232223 in words is "twenty-one billion, three hundred twenty million, two hundred thirty-two thousand, two hundred twenty-three".