21243320342 has 8 divisors (see below), whose sum is σ = 31946896800. Its totient is φ = 10594354744.

The previous prime is 21243320321. The next prime is 21243320359. The reversal of 21243320342 is 24302334212.

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

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, 13651742 + ... + 13653297.

It is an arithmetic number, because the mean of its divisors is an integer number (3993362100).

Almost surely, 2^21243320342 is an apocalyptic number.

21243320342 is a deficient number, since it is larger than the sum of its proper divisors (10703576458).

21243320342 is a wasteful number, since it uses less digits than its factorization.

21243320342 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27305430.

The product of its (nonzero) digits is 6912, while the sum is 26.

Adding to 21243320342 its reverse (24302334212), we get a palindrome (45545654554).

The spelling of 21243320342 in words is "twenty-one billion, two hundred forty-three million, three hundred twenty thousand, three hundred forty-two".