21320126732243 has 2 divisors, whose sum is σ = 21320126732244. Its totient is φ = 21320126732242.

The previous prime is 21320126732141. The next prime is 21320126732299. The reversal of 21320126732243 is 34223762102312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21320126732243 - 2⁸ = 21320126731987 is a prime.

It is a super-2 number, since 2×21320126732243² (a number of 27 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21320126732197 and 21320126732206.

It is not a weakly prime, because it can be changed into another prime (21320126734243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660063366121 + 10660063366122.

It is an arithmetic number, because the mean of its divisors is an integer number (10660063366122).

Almost surely, 2^{21320126732243} is an apocalyptic number.

21320126732243 is a deficient number, since it is larger than the sum of its proper divisors (1).

21320126732243 is an equidigital number, since it uses as much as digits as its factorization.

21320126732243 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 38.

Adding to 21320126732243 its reverse (34223762102312), we get a palindrome (55543888834555).

The spelling of 21320126732243 in words is "twenty-one trillion, three hundred twenty billion, one hundred twenty-six million, seven hundred thirty-two thousand, two hundred forty-three".