21312121110223 has 2 divisors, whose sum is σ = 21312121110224. Its totient is φ = 21312121110222.

The previous prime is 21312121110211. The next prime is 21312121110257. The reversal of 21312121110223 is 32201112121312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21312121110223 - 2¹³ = 21312121102031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21312121110194 and 21312121110203.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21312125110223) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10656060555111 + 10656060555112.

It is an arithmetic number, because the mean of its divisors is an integer number (10656060555112).

Almost surely, 2^{21312121110223} is an apocalyptic number.

21312121110223 is a deficient number, since it is larger than the sum of its proper divisors (1).

21312121110223 is an equidigital number, since it uses as much as digits as its factorization.

21312121110223 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 22.

Adding to 21312121110223 its reverse (32201112121312), we get a palindrome (53513233231535).

The spelling of 21312121110223 in words is "twenty-one trillion, three hundred twelve billion, one hundred twenty-one million, one hundred ten thousand, two hundred twenty-three".