21223223251423 has 2 divisors, whose sum is σ = 21223223251424. Its totient is φ = 21223223251422.

The previous prime is 21223223251403. The next prime is 21223223251453. The reversal of 21223223251423 is 32415232232212.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21223223251423 - 2¹³ = 21223223243231 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21223223251403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10611611625711 + 10611611625712.

It is an arithmetic number, because the mean of its divisors is an integer number (10611611625712).

Almost surely, 2^{21223223251423} is an apocalyptic number.

21223223251423 is a deficient number, since it is larger than the sum of its proper divisors (1).

21223223251423 is an equidigital number, since it uses as much as digits as its factorization.

21223223251423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 69120, while the sum is 34.

Adding to 21223223251423 its reverse (32415232232212), we get a palindrome (53638455483635).

The spelling of 21223223251423 in words is "twenty-one trillion, two hundred twenty-three billion, two hundred twenty-three million, two hundred fifty-one thousand, four hundred twenty-three".