21243034004342 has 8 divisors (see below), whose sum is σ = 31920551976600. Its totient is φ = 10602850012144.

The previous prime is 21243034004321. The next prime is 21243034004383. The reversal of 21243034004342 is 24340043034212.

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

It is a junction number, because it is equal to n+sod(n) for n = 21243034004299 and 21243034004308.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9333493592 + ... + 9333495867.

It is an arithmetic number, because the mean of its divisors is an integer number (3990068997075).

Almost surely, 2^{21243034004342} is an apocalyptic number.

21243034004342 is a deficient number, since it is larger than the sum of its proper divisors (10677517972258).

21243034004342 is a wasteful number, since it uses less digits than its factorization.

21243034004342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18666990030.

The product of its (nonzero) digits is 55296, while the sum is 32.

Adding to 21243034004342 its reverse (24340043034212), we get a palindrome (45583077038554).

The spelling of 21243034004342 in words is "twenty-one trillion, two hundred forty-three billion, thirty-four million, four thousand, three hundred forty-two".