21423400312133 has 2 divisors, whose sum is σ = 21423400312134. Its totient is φ = 21423400312132.

The previous prime is 21423400312123. The next prime is 21423400312157. The reversal of 21423400312133 is 33121300432412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13388120004484 + 8035280307649 = 3658978^2 + 2834657^2 .

It is a cyclic number.

It is not a de Polignac number, because 21423400312133 - 2⁴ = 21423400312117 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21423400312096 and 21423400312105.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21423400312123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10711700156066 + 10711700156067.

It is an arithmetic number, because the mean of its divisors is an integer number (10711700156067).

Almost surely, 2^{21423400312133} is an apocalyptic number.

It is an amenable number.

21423400312133 is a deficient number, since it is larger than the sum of its proper divisors (1).

21423400312133 is an equidigital number, since it uses as much as digits as its factorization.

21423400312133 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 29.

Adding to 21423400312133 its reverse (33121300432412), we get a palindrome (54544700744545).

The spelling of 21423400312133 in words is "twenty-one trillion, four hundred twenty-three billion, four hundred million, three hundred twelve thousand, one hundred thirty-three".