21717300227 has 4 divisors (see below), whose sum is σ = 24819771696. Its totient is φ = 18614828760.

The previous prime is 21717300217. The next prime is 21717300229. The reversal of 21717300227 is 72200371712.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21717300227 - 2³⁴ = 4537431043 is a prime.

It is a super-2 number, since 2×21717300227² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21717300193 and 21717300202.

It is not an unprimeable number, because it can be changed into a prime (21717300229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1551235724 + ... + 1551235737.

It is an arithmetic number, because the mean of its divisors is an integer number (6204942924).

Almost surely, 2^21717300227 is an apocalyptic number.

21717300227 is a deficient number, since it is larger than the sum of its proper divisors (3102471469).

21717300227 is an equidigital number, since it uses as much as digits as its factorization.

21717300227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3102471468.

The product of its (nonzero) digits is 8232, while the sum is 32.

Adding to 21717300227 its reverse (72200371712), we get a palindrome (93917671939).

The spelling of 21717300227 in words is "twenty-one billion, seven hundred seventeen million, three hundred thousand, two hundred twenty-seven".