21311202312223 has 2 divisors, whose sum is σ = 21311202312224. Its totient is φ = 21311202312222.

The previous prime is 21311202311977. The next prime is 21311202312241. The reversal of 21311202312223 is 32221320211312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21311202312223 - 2¹³ = 21311202304031 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21311202342223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10655601156111 + 10655601156112.

It is an arithmetic number, because the mean of its divisors is an integer number (10655601156112).

Almost surely, 2^{21311202312223} is an apocalyptic number.

21311202312223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21311202312223 is an equidigital number, since it uses as much as digits as its factorization.

21311202312223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1728, while the sum is 25.

Adding to 21311202312223 its reverse (32221320211312), we get a palindrome (53532522523535).

The spelling of 21311202312223 in words is "twenty-one trillion, three hundred eleven billion, two hundred two million, three hundred twelve thousand, two hundred twenty-three".