21868522167 has 4 divisors (see below), whose sum is σ = 29158029560. Its totient is φ = 14579014776.

The previous prime is 21868522157. The next prime is 21868522171. The reversal of 21868522167 is 76122586812.

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

It is not a de Polignac number, because 21868522167 - 2¹⁴ = 21868505783 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21868522157) 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, 3644753692 + ... + 3644753697.

It is an arithmetic number, because the mean of its divisors is an integer number (7289507390).

Almost surely, 2^21868522167 is an apocalyptic number.

21868522167 is a deficient number, since it is larger than the sum of its proper divisors (7289507393).

21868522167 is an equidigital number, since it uses as much as digits as its factorization.

21868522167 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7289507392.

The product of its digits is 645120, while the sum is 48.

The spelling of 21868522167 in words is "twenty-one billion, eight hundred sixty-eight million, five hundred twenty-two thousand, one hundred sixty-seven".