21204130343 has 8 divisors (see below), whose sum is σ = 23568227856. Its totient is φ = 18912774400.

The previous prime is 21204130291. The next prime is 21204130369. The reversal of 21204130343 is 34303140212.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21204130343 - 2⁶ = 21204130279 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 (21204130393) 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, 18184778 + ... + 18185943.

It is an arithmetic number, because the mean of its divisors is an integer number (2946028482).

Almost surely, 2^21204130343 is an apocalyptic number.

21204130343 is a deficient number, since it is larger than the sum of its proper divisors (2364097513).

21204130343 is a wasteful number, since it uses less digits than its factorization.

21204130343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36370785.

The product of its (nonzero) digits is 1728, while the sum is 23.

Adding to 21204130343 its reverse (34303140212), we get a palindrome (55507270555).

The spelling of 21204130343 in words is "twenty-one billion, two hundred four million, one hundred thirty thousand, three hundred forty-three".