21797168827 has 8 divisors (see below), whose sum is σ = 25584322016. Its totient is φ = 18178333632.

The previous prime is 21797168713. The next prime is 21797168863. The reversal of 21797168827 is 72886179712.

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 21797168827 - 2¹⁹ = 21796644539 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21797168527) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 42079218 + ... + 42079735.

It is an arithmetic number, because the mean of its divisors is an integer number (3198040252).

Almost surely, 2^21797168827 is an apocalyptic number.

21797168827 is a deficient number, since it is larger than the sum of its proper divisors (3787153189).

21797168827 is an equidigital number, since it uses as much as digits as its factorization.

21797168827 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84158997.

The product of its digits is 4741632, while the sum is 58.

The spelling of 21797168827 in words is "twenty-one billion, seven hundred ninety-seven million, one hundred sixty-eight thousand, eight hundred twenty-seven".