21704255343 has 16 divisors (see below), whose sum is σ = 32198348640. Its totient is φ = 14449750272.

The previous prime is 21704255323. The next prime is 21704255393. The reversal of 21704255343 is 34355240712.

21704255343 is a `hidden beast` number, since 21 + 7 + 0 + 42 + 553 + 43 = 666.

It is not a de Polignac number, because 21704255343 - 2¹³ = 21704247151 is a prime.

It is a super-4 number, since 4×21704255343⁴ (a number of 42 digits) contains 4444 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21704255298 and 21704255307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21704255323) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 528546 + ... + 568127.

It is an arithmetic number, because the mean of its divisors is an integer number (2012396790).

Almost surely, 2^21704255343 is an apocalyptic number.

21704255343 is a deficient number, since it is larger than the sum of its proper divisors (10494093297).

21704255343 is a wasteful number, since it uses less digits than its factorization.

21704255343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1097415 (or 1097409 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 36.

The spelling of 21704255343 in words is "twenty-one billion, seven hundred four million, two hundred fifty-five thousand, three hundred forty-three".