21436635706417 has 16 divisors (see below), whose sum is σ = 21882195878400. Its totient is φ = 20996205493120.

The previous prime is 21436635706373. The next prime is 21436635706441. The reversal of 21436635706417 is 71460753663412.

It is a cyclic number.

It is not a de Polignac number, because 21436635706417 - 2¹⁹ = 21436635182129 is a prime.

It is a super-2 number, since 2×21436635706417² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21436635706117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4843584 + ... + 8144542.

It is an arithmetic number, because the mean of its divisors is an integer number (1367637242400).

Almost surely, 2^{21436635706417} is an apocalyptic number.

It is an amenable number.

21436635706417 is a deficient number, since it is larger than the sum of its proper divisors (445560171983).

21436635706417 is a wasteful number, since it uses less digits than its factorization.

21436635706417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3301736.

The product of its (nonzero) digits is 15240960, while the sum is 55.

The spelling of 21436635706417 in words is "twenty-one trillion, four hundred thirty-six billion, six hundred thirty-five million, seven hundred six thousand, four hundred seventeen".