21234031223 has 2 divisors, whose sum is σ = 21234031224. Its totient is φ = 21234031222.

The previous prime is 21234031193. The next prime is 21234031279. The reversal of 21234031223 is 32213043212.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21234031223 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234036223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617015611 + 10617015612.

It is an arithmetic number, because the mean of its divisors is an integer number (10617015612).

Almost surely, 2^21234031223 is an apocalyptic number.

21234031223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234031223 is an equidigital number, since it uses as much as digits as its factorization.

21234031223 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21234031223 its reverse (32213043212), we get a palindrome (53447074435).

The spelling of 21234031223 in words is "twenty-one billion, two hundred thirty-four million, thirty-one thousand, two hundred twenty-three".