21020324342 has 4 divisors (see below), whose sum is σ = 31530486516. Its totient is φ = 10510162170.

The previous prime is 21020324279. The next prime is 21020324387. The reversal of 21020324342 is 24342302012.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5255081084 + ... + 5255081087.

It is an arithmetic number, because the mean of its divisors is an integer number (7882621629).

Almost surely, 2^21020324342 is an apocalyptic number.

21020324342 is a deficient number, since it is larger than the sum of its proper divisors (10510162174).

21020324342 is a wasteful number, since it uses less digits than its factorization.

21020324342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10510162173.

The product of its (nonzero) digits is 2304, while the sum is 23.

Adding to 21020324342 its reverse (24342302012), we get a palindrome (45362626354).

The spelling of 21020324342 in words is "twenty-one billion, twenty million, three hundred twenty-four thousand, three hundred forty-two".