21240324401369 has 2 divisors, whose sum is σ = 21240324401370. Its totient is φ = 21240324401368.

The previous prime is 21240324401323. The next prime is 21240324401449. The reversal of 21240324401369 is 96310442304212.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 17482542151369 + 3757782250000 = 4181213^2 + 1938500^2 .

It is a cyclic number.

It is not a de Polignac number, because 21240324401369 - 2⁸ = 21240324401113 is a prime.

It is a super-2 number, since 2×21240324401369² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21240324406369) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10620162200684 + 10620162200685.

It is an arithmetic number, because the mean of its divisors is an integer number (10620162200685).

Almost surely, 2^{21240324401369} is an apocalyptic number.

It is an amenable number.

21240324401369 is a deficient number, since it is larger than the sum of its proper divisors (1).

21240324401369 is an equidigital number, since it uses as much as digits as its factorization.

21240324401369 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 248832, while the sum is 41.

The spelling of 21240324401369 in words is "twenty-one trillion, two hundred forty billion, three hundred twenty-four million, four hundred one thousand, three hundred sixty-nine".