21004130342 has 16 divisors (see below), whose sum is σ = 34757305632. Its totient is φ = 9457769280.

The previous prime is 21004130341. The next prime is 21004130369. The reversal of 21004130342 is 24303140012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21004130341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9850778 + ... + 9852909.

It is an arithmetic number, because the mean of its divisors is an integer number (2172331602).

Almost surely, 2^21004130342 is an apocalyptic number.

21004130342 is a deficient number, since it is larger than the sum of its proper divisors (13753175290).

21004130342 is a wasteful number, since it uses less digits than its factorization.

21004130342 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19703743.

The product of its (nonzero) digits is 576, while the sum is 20.

Adding to 21004130342 its reverse (24303140012), we get a palindrome (45307270354).

The spelling of 21004130342 in words is "twenty-one billion, four million, one hundred thirty thousand, three hundred forty-two".