21908324263 has 8 divisors (see below), whose sum is σ = 25381072928. Its totient is φ = 18521322624.

The previous prime is 21908324233. The next prime is 21908324287. The reversal of 21908324263 is 36242380912.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21908324263 - 2¹⁷ = 21908193191 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 (21908324233) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21436206 + ... + 21437227.

It is an arithmetic number, because the mean of its divisors is an integer number (3172634116).

Almost surely, 2^21908324263 is an apocalyptic number.

21908324263 is a deficient number, since it is larger than the sum of its proper divisors (3472748665).

21908324263 is an equidigital number, since it uses as much as digits as its factorization.

21908324263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42873513.

The product of its (nonzero) digits is 124416, while the sum is 40.

The spelling of 21908324263 in words is "twenty-one billion, nine hundred eight million, three hundred twenty-four thousand, two hundred sixty-three".