21210010223 has 2 divisors, whose sum is σ = 21210010224. Its totient is φ = 21210010222.

The previous prime is 21210010207. The next prime is 21210010247. The reversal of 21210010223 is 32201001212.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21210010223 - 2⁴ = 21210010207 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21210010198 and 21210010207.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21210010253) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10605005111 + 10605005112.

It is an arithmetic number, because the mean of its divisors is an integer number (10605005112).

Almost surely, 2^21210010223 is an apocalyptic number.

21210010223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21210010223 is an equidigital number, since it uses as much as digits as its factorization.

21210010223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 48, while the sum is 14.

Adding to 21210010223 its reverse (32201001212), we get a palindrome (53411011435).

The spelling of 21210010223 in words is "twenty-one billion, two hundred ten million, ten thousand, two hundred twenty-three".