21303312331 has 8 divisors (see below), whose sum is σ = 24348857600. Its totient is φ = 18258320808.

The previous prime is 21303312319. The next prime is 21303312337. The reversal of 21303312331 is 13321330312.

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

It is not a de Polignac number, because 21303312331 - 2⁹ = 21303311819 is a prime.

It is a super-2 number, since 2×21303312331² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21303312337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 52431 + ... + 212968.

It is an arithmetic number, because the mean of its divisors is an integer number (3043607200).

Almost surely, 2^21303312331 is an apocalyptic number.

21303312331 is a deficient number, since it is larger than the sum of its proper divisors (3045545269).

21303312331 is a wasteful number, since it uses less digits than its factorization.

21303312331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276873.

The product of its (nonzero) digits is 972, while the sum is 22.

Adding to 21303312331 its reverse (13321330312), we get a palindrome (34624642643).

The spelling of 21303312331 in words is "twenty-one billion, three hundred three million, three hundred twelve thousand, three hundred thirty-one".