21418086087289 has 2 divisors, whose sum is σ = 21418086087290. Its totient is φ = 21418086087288.

The previous prime is 21418086087173. The next prime is 21418086087301. The reversal of 21418086087289 is 98278068081412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20771790681664 + 646295405625 = 4557608^2 + 803925^2 .

It is a cyclic number.

It is not a de Polignac number, because 21418086087289 - 2¹³ = 21418086079097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21418086087289.

It is not a weakly prime, because it can be changed into another prime (21418086081289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10709043043644 + 10709043043645.

It is an arithmetic number, because the mean of its divisors is an integer number (10709043043645).

Almost surely, 2^{21418086087289} is an apocalyptic number.

It is an amenable number.

21418086087289 is a deficient number, since it is larger than the sum of its proper divisors (1).

21418086087289 is an equidigital number, since it uses as much as digits as its factorization.

21418086087289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24772608, while the sum is 64.

The spelling of 21418086087289 in words is "twenty-one trillion, four hundred eighteen billion, eighty-six million, eighty-seven thousand, two hundred eighty-nine".