21653324343 has 24 divisors (see below), whose sum is σ = 35765403648. Its totient is φ = 12366324432.

The previous prime is 21653324339. The next prime is 21653324419. The reversal of 21653324343 is 34342335612.

21653324343 is a `hidden beast` number, since 216 + 5 + 3 + 3 + 2 + 434 + 3 = 666.

It is not a de Polignac number, because 21653324343 - 2² = 21653324339 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21653324298 and 21653324307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653324333) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15946 + ... + 208712.

It is an arithmetic number, because the mean of its divisors is an integer number (1490225152).

Almost surely, 2^21653324343 is an apocalyptic number.

21653324343 is a deficient number, since it is larger than the sum of its proper divisors (14112079305).

21653324343 is a wasteful number, since it uses less digits than its factorization.

21653324343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 194563 (or 194560 counting only the distinct ones).

The product of its digits is 155520, while the sum is 36.

Adding to 21653324343 its reverse (34342335612), we get a palindrome (55995659955).

The spelling of 21653324343 in words is "twenty-one billion, six hundred fifty-three million, three hundred twenty-four thousand, three hundred forty-three".