21330132299981 has 2 divisors, whose sum is σ = 21330132299982. Its totient is φ = 21330132299980.

The previous prime is 21330132299929. The next prime is 21330132300091. The reversal of 21330132299981 is 18999223103312.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 21231212614756 + 98919685225 = 4607734^2 + 314515^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21330132299981 is a prime.

It is a super-2 number, since 2×21330132299981² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21330132299911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665066149990 + 10665066149991.

It is an arithmetic number, because the mean of its divisors is an integer number (10665066149991).

Almost surely, 2^{21330132299981} is an apocalyptic number.

It is an amenable number.

21330132299981 is a deficient number, since it is larger than the sum of its proper divisors (1).

21330132299981 is an equidigital number, since it uses as much as digits as its factorization.

21330132299981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1259712, while the sum is 53.

The spelling of 21330132299981 in words is "twenty-one trillion, three hundred thirty billion, one hundred thirty-two million, two hundred ninety-nine thousand, nine hundred eighty-one".