21010123223 has 2 divisors, whose sum is σ = 21010123224. Its totient is φ = 21010123222.

The previous prime is 21010123213. The next prime is 21010123279. The reversal of 21010123223 is 32232101012.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21010123223 - 2²² = 21005928919 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21010123213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10505061611 + 10505061612.

It is an arithmetic number, because the mean of its divisors is an integer number (10505061612).

Almost surely, 2^21010123223 is an apocalyptic number.

21010123223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21010123223 is an equidigital number, since it uses as much as digits as its factorization.

21010123223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 144, while the sum is 17.

Adding to 21010123223 its reverse (32232101012), we get a palindrome (53242224235).

The spelling of 21010123223 in words is "twenty-one billion, ten million, one hundred twenty-three thousand, two hundred twenty-three".