21427472017 has 8 divisors (see below), whose sum is σ = 24798521600. Its totient is φ = 18133917984.

The previous prime is 21427471927. The next prime is 21427472021. The reversal of 21427472017 is 71027472412.

It is a happy number.

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

It is not a de Polignac number, because 21427472017 - 2¹¹ = 21427469969 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21427472047) 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, 19373292 + ... + 19374397.

It is an arithmetic number, because the mean of its divisors is an integer number (3099815200).

Almost surely, 2^21427472017 is an apocalyptic number.

It is an amenable number.

21427472017 is a deficient number, since it is larger than the sum of its proper divisors (3371049583).

21427472017 is an equidigital number, since it uses as much as digits as its factorization.

21427472017 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38747775.

The product of its (nonzero) digits is 43904, while the sum is 37.

The spelling of 21427472017 in words is "twenty-one billion, four hundred twenty-seven million, four hundred seventy-two thousand, seventeen".