21210210223 has 2 divisors, whose sum is σ = 21210210224. Its totient is φ = 21210210222.

The previous prime is 21210210193. The next prime is 21210210227. The reversal of 21210210223 is 32201201212.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21210210223 - 2¹⁷ = 21210079151 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210210197 and 21210210206.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210210227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605105111 + 10605105112.

It is an arithmetic number, because the mean of its divisors is an integer number (10605105112).

Almost surely, 2^21210210223 is an apocalyptic number.

21210210223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210210223 is an equidigital number, since it uses as much as digits as its factorization.

21210210223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 96, while the sum is 16.

Adding to 21210210223 its reverse (32201201212), we get a palindrome (53411411435).

The spelling of 21210210223 in words is "twenty-one billion, two hundred ten million, two hundred ten thousand, two hundred twenty-three".