21321300331 has 2 divisors, whose sum is σ = 21321300332. Its totient is φ = 21321300330.

The previous prime is 21321300317. The next prime is 21321300353. The reversal of 21321300331 is 13300312312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21321300331 - 2²³ = 21312911723 is a prime.

It is a super-2 number, since 2×21321300331² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 21321300299 and 21321300308.

It is not a weakly prime, because it can be changed into another prime (21321300361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10660650165 + 10660650166.

It is an arithmetic number, because the mean of its divisors is an integer number (10660650166).

Almost surely, 2^21321300331 is an apocalyptic number.

21321300331 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321300331 is an equidigital number, since it uses as much as digits as its factorization.

21321300331 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21321300331 its reverse (13300312312), we get a palindrome (34621612643).

The spelling of 21321300331 in words is "twenty-one billion, three hundred twenty-one million, three hundred thousand, three hundred thirty-one".