21321033101 has 2 divisors, whose sum is σ = 21321033102. Its totient is φ = 21321033100.

The previous prime is 21321033067. The next prime is 21321033109. The reversal of 21321033101 is 10133012312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 17589655876 + 3731377225 = 132626^2 + 61085^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21321033101 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21321033101.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21321033109) 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, 10660516550 + 10660516551.

It is an arithmetic number, because the mean of its divisors is an integer number (10660516551).

Almost surely, 2^21321033101 is an apocalyptic number.

It is an amenable number.

21321033101 is a deficient number, since it is larger than the sum of its proper divisors (1).

21321033101 is an equidigital number, since it uses as much as digits as its factorization.

21321033101 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 108, while the sum is 17.

Adding to 21321033101 its reverse (10133012312), we get a palindrome (31454045413).

The spelling of 21321033101 in words is "twenty-one billion, three hundred twenty-one million, thirty-three thousand, one hundred one".