21477317530645 has 8 divisors (see below), whose sum is σ = 26083296471456. Its totient is φ = 16974843734736.

The previous prime is 21477317530619. The next prime is 21477317530703. The reversal of 21477317530645 is 54603571377412.

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 21477317530645 - 2²⁷ = 21477183312917 is a prime.

It is a super-2 number, since 2×21477317530645² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25876285767 + ... + 25876286596.

It is an arithmetic number, because the mean of its divisors is an integer number (3260412058932).

Almost surely, 2^{21477317530645} is an apocalyptic number.

It is an amenable number.

21477317530645 is a deficient number, since it is larger than the sum of its proper divisors (4605978940811).

21477317530645 is an equidigital number, since it uses as much as digits as its factorization.

21477317530645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51752572451.

The product of its (nonzero) digits is 14817600, while the sum is 55.

The spelling of 21477317530645 in words is "twenty-one trillion, four hundred seventy-seven billion, three hundred seventeen million, five hundred thirty thousand, six hundred forty-five".