21321310323 has 8 divisors (see below), whose sum is σ = 28536507648. Its totient is φ = 14160159944.

The previous prime is 21321310289. The next prime is 21321310343. The reversal of 21321310323 is 32301312312.

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 21321310323 - 2¹⁶ = 21321244787 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21321310323.

It is not an unprimeable number, because it can be changed into a prime (21321310343) by changing a digit.

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, 13510815 + ... + 13512392.

It is an arithmetic number, because the mean of its divisors is an integer number (3567063456).

Almost surely, 2^21321310323 is an apocalyptic number.

21321310323 is a deficient number, since it is larger than the sum of its proper divisors (7215197325).

21321310323 is a wasteful number, since it uses less digits than its factorization.

21321310323 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27023473.

The product of its (nonzero) digits is 648, while the sum is 21.

Adding to 21321310323 its reverse (32301312312), we get a palindrome (53622622635).

The spelling of 21321310323 in words is "twenty-one billion, three hundred twenty-one million, three hundred ten thousand, three hundred twenty-three".