21451364361269 has 2 divisors, whose sum is σ = 21451364361270. Its totient is φ = 21451364361268.

The previous prime is 21451364361227. The next prime is 21451364361403. The reversal of 21451364361269 is 96216346315412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21171271500625 + 280092860644 = 4601225^2 + 529238^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21451364361269 is a prime.

It is a super-2 number, since 2×21451364361269² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21451364361269.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21451364361569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10725682180634 + 10725682180635.

It is an arithmetic number, because the mean of its divisors is an integer number (10725682180635).

Almost surely, 2^{21451364361269} is an apocalyptic number.

It is an amenable number.

21451364361269 is a deficient number, since it is larger than the sum of its proper divisors (1).

21451364361269 is an equidigital number, since it uses as much as digits as its factorization.

21451364361269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 53.

The spelling of 21451364361269 in words is "twenty-one trillion, four hundred fifty-one billion, three hundred sixty-four million, three hundred sixty-one thousand, two hundred sixty-nine".