21170227499 has 8 divisors (see below), whose sum is σ = 21195080160. Its totient is φ = 21145392576.

The previous prime is 21170227489. The next prime is 21170227511. The reversal of 21170227499 is 99472207112.

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 21170227499 - 2¹⁶ = 21170161963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21170227439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5669237 + ... + 5672969.

It is an arithmetic number, because the mean of its divisors is an integer number (2649385020).

Almost surely, 2^21170227499 is an apocalyptic number.

21170227499 is a deficient number, since it is larger than the sum of its proper divisors (24852661).

21170227499 is a wasteful number, since it uses less digits than its factorization.

21170227499 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8869.

The product of its (nonzero) digits is 127008, while the sum is 44.

The spelling of 21170227499 in words is "twenty-one billion, one hundred seventy million, two hundred twenty-seven thousand, four hundred ninety-nine".