21356140024417 has 8 divisors (see below), whose sum is σ = 23310019472832. Its totient is φ = 19404329271600.

The previous prime is 21356140024409. The next prime is 21356140024553. The reversal of 21356140024417 is 71442004165312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21356140024417 - 2³ = 21356140024409 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21356140024417.

It is not an unprimeable number, because it can be changed into a prime (21356140025417) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 517152309 + ... + 517193602.

It is an arithmetic number, because the mean of its divisors is an integer number (2913752434104).

Almost surely, 2^{21356140024417} is an apocalyptic number.

It is an amenable number.

21356140024417 is a deficient number, since it is larger than the sum of its proper divisors (1953879448415).

21356140024417 is a wasteful number, since it uses less digits than its factorization.

21356140024417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1034347799.

The product of its (nonzero) digits is 161280, while the sum is 40.

Adding to 21356140024417 its reverse (71442004165312), we get a palindrome (92798144189729).

The spelling of 21356140024417 in words is "twenty-one trillion, three hundred fifty-six billion, one hundred forty million, twenty-four thousand, four hundred seventeen".