21417812260991 has 8 divisors (see below), whose sum is σ = 22170093677280. Its totient is φ = 20666446589152.

The previous prime is 21417812260987. The next prime is 21417812261009. The reversal of 21417812260991 is 19906221871412.

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 21417812260991 - 2² = 21417812260987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21417812260921) 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, 228888515 + ... + 228982068.

It is an arithmetic number, because the mean of its divisors is an integer number (2771261709660).

Almost surely, 2^{21417812260991} is an apocalyptic number.

21417812260991 is a deficient number, since it is larger than the sum of its proper divisors (752281416289).

21417812260991 is a wasteful number, since it uses less digits than its factorization.

21417812260991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 457872225.

The product of its (nonzero) digits is 870912, while the sum is 53.

The spelling of 21417812260991 in words is "twenty-one trillion, four hundred seventeen billion, eight hundred twelve million, two hundred sixty thousand, nine hundred ninety-one".