21042313015 has 8 divisors (see below), whose sum is σ = 25252894800. Its totient is φ = 16832437632.

The previous prime is 21042313009. The next prime is 21042313037. The reversal of 21042313015 is 51031324012.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 21042313015 - 2¹⁷ = 21042181943 is a prime.

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 in 7 ways as a sum of consecutive naturals, for example, 108690 + ... + 232159.

It is an arithmetic number, because the mean of its divisors is an integer number (3156611850).

Almost surely, 2^21042313015 is an apocalyptic number.

21042313015 is a deficient number, since it is larger than the sum of its proper divisors (4210581785).

21042313015 is a wasteful number, since it uses less digits than its factorization.

21042313015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 353201.

The product of its (nonzero) digits is 720, while the sum is 22.

Adding to 21042313015 its reverse (51031324012), we get a palindrome (72073637027).

The spelling of 21042313015 in words is "twenty-one billion, forty-two million, three hundred thirteen thousand, fifteen".