21320334243 has 48 divisors (see below), whose sum is σ = 34528437216. Its totient is φ = 13068656640.

The previous prime is 21320334241. The next prime is 21320334281. The reversal of 21320334243 is 34243302312.

21320334243 is a `hidden beast` number, since 2 + 1 + 320 + 334 + 2 + 4 + 3 = 666.

It is not a de Polignac number, because 21320334243 - 2¹ = 21320334241 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (21320334241) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 798733 + ... + 824993.

It is an arithmetic number, because the mean of its divisors is an integer number (719342442).

Almost surely, 2^21320334243 is an apocalyptic number.

21320334243 is a deficient number, since it is larger than the sum of its proper divisors (13208102973).

21320334243 is a wasteful number, since it uses less digits than its factorization.

21320334243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26546 (or 26534 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 27.

Adding to 21320334243 its reverse (34243302312), we get a palindrome (55563636555).

The spelling of 21320334243 in words is "twenty-one billion, three hundred twenty million, three hundred thirty-four thousand, two hundred forty-three".