21308338263 has 8 divisors (see below), whose sum is σ = 28421678448. Its totient is φ = 14200278464.

The previous prime is 21308338243. The next prime is 21308338277. The reversal of 21308338263 is 36283380312.

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 21308338263 - 2³³ = 12718403671 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21308338223) 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, 1310670 + ... + 1326827.

It is an arithmetic number, because the mean of its divisors is an integer number (3552709806).

Almost surely, 2^21308338263 is an apocalyptic number.

21308338263 is a deficient number, since it is larger than the sum of its proper divisors (7113340185).

21308338263 is a wasteful number, since it uses less digits than its factorization.

21308338263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2640193.

The product of its (nonzero) digits is 124416, while the sum is 39.

The spelling of 21308338263 in words is "twenty-one billion, three hundred eight million, three hundred thirty-eight thousand, two hundred sixty-three".