21234252223 has 2 divisors, whose sum is σ = 21234252224. Its totient is φ = 21234252222.

The previous prime is 21234252157. The next prime is 21234252241. The reversal of 21234252223 is 32225243212.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21234252223 - 2⁹ = 21234251711 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21234252191 and 21234252200.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21234252323) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10617126111 + 10617126112.

It is an arithmetic number, because the mean of its divisors is an integer number (10617126112).

Almost surely, 2^21234252223 is an apocalyptic number.

21234252223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21234252223 is an equidigital number, since it uses as much as digits as its factorization.

21234252223 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 28.

Adding to 21234252223 its reverse (32225243212), we get a palindrome (53459495435).

The spelling of 21234252223 in words is "twenty-one billion, two hundred thirty-four million, two hundred fifty-two thousand, two hundred twenty-three".