21452365617401 has 2 divisors, whose sum is σ = 21452365617402. Its totient is φ = 21452365617400.

The previous prime is 21452365617373. The next prime is 21452365617437. The reversal of 21452365617401 is 10471656325412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 13217623716025 + 8234741901376 = 3635605^2 + 2869624^2 .

It is a cyclic number.

It is not a de Polignac number, because 21452365617401 - 2¹⁰ = 21452365616377 is a prime.

It is not a weakly prime, because it can be changed into another prime (21452365617601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10726182808700 + 10726182808701.

It is an arithmetic number, because the mean of its divisors is an integer number (10726182808701).

Almost surely, 2^{21452365617401} is an apocalyptic number.

It is an amenable number.

21452365617401 is a deficient number, since it is larger than the sum of its proper divisors (1).

21452365617401 is an equidigital number, since it uses as much as digits as its factorization.

21452365617401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1209600, while the sum is 47.

The spelling of 21452365617401 in words is "twenty-one trillion, four hundred fifty-two billion, three hundred sixty-five million, six hundred seventeen thousand, four hundred one".