21304030031 has 8 divisors (see below), whose sum is σ = 21606609024. Its totient is φ = 21001521240.

The previous prime is 21304030021. The next prime is 21304030061. The reversal of 21304030031 is 13003040312.

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 21304030031 - 2¹⁰ = 21304029007 is a prime.

It is a super-2 number, since 2×21304030031² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21304029991 and 21304030009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21304030001) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1049480 + ... + 1069586.

It is an arithmetic number, because the mean of its divisors is an integer number (2700826128).

Almost surely, 2^21304030031 is an apocalyptic number.

21304030031 is a deficient number, since it is larger than the sum of its proper divisors (302578993).

21304030031 is a wasteful number, since it uses less digits than its factorization.

21304030031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35101.

The product of its (nonzero) digits is 216, while the sum is 17.

Adding to 21304030031 its reverse (13003040312), we get a palindrome (34307070343).

The spelling of 21304030031 in words is "twenty-one billion, three hundred four million, thirty thousand, thirty-one".