21325303991 has 2 divisors, whose sum is σ = 21325303992. Its totient is φ = 21325303990.

The previous prime is 21325303957. The next prime is 21325304051. The reversal of 21325303991 is 19930352312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21325303991 - 2¹⁸ = 21325041847 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21325303291) 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 as a sum of consecutive naturals, namely, 10662651995 + 10662651996.

It is an arithmetic number, because the mean of its divisors is an integer number (10662651996).

Almost surely, 2^21325303991 is an apocalyptic number.

21325303991 is a deficient number, since it is larger than the sum of its proper divisors (1).

21325303991 is an equidigital number, since it uses as much as digits as its factorization.

21325303991 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 43740, while the sum is 38.

The spelling of 21325303991 in words is "twenty-one billion, three hundred twenty-five million, three hundred three thousand, nine hundred ninety-one".