21170456683 has 4 divisors (see below), whose sum is σ = 21171062968. Its totient is φ = 21169850400.

The previous prime is 21170456653. The next prime is 21170456717. The reversal of 21170456683 is 38665407112.

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 21170456683 - 2¹⁷ = 21170325611 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21170456603) 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, 247341 + ... + 321742.

It is an arithmetic number, because the mean of its divisors is an integer number (5292765742).

Almost surely, 2^21170456683 is an apocalyptic number.

21170456683 is a deficient number, since it is larger than the sum of its proper divisors (606285).

21170456683 is an equidigital number, since it uses as much as digits as its factorization.

21170456683 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 606284.

The product of its (nonzero) digits is 241920, while the sum is 43.

The spelling of 21170456683 in words is "twenty-one billion, one hundred seventy million, four hundred fifty-six thousand, six hundred eighty-three".