21847244263 has 4 divisors (see below), whose sum is σ = 23527801528. Its totient is φ = 20166687000.

The previous prime is 21847244261. The next prime is 21847244333. The reversal of 21847244263 is 36244274812.

It is a happy number.

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 21847244263 - 2¹ = 21847244261 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 (21847244261) 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, 840278613 + ... + 840278638.

It is an arithmetic number, because the mean of its divisors is an integer number (5881950382).

Almost surely, 2^21847244263 is an apocalyptic number.

21847244263 is a deficient number, since it is larger than the sum of its proper divisors (1680557265).

21847244263 is a wasteful number, since it uses less digits than its factorization.

21847244263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1680557264.

The product of its digits is 516096, while the sum is 43.

The spelling of 21847244263 in words is "twenty-one billion, eight hundred forty-seven million, two hundred forty-four thousand, two hundred sixty-three".