21001331302933 has 2 divisors, whose sum is σ = 21001331302934. Its totient is φ = 21001331302932.

The previous prime is 21001331302811. The next prime is 21001331303011. The reversal of 21001331302933 is 33920313310012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 15803669996689 + 5197661306244 = 3975383^2 + 2279838^2 .

It is a cyclic number.

It is not a de Polignac number, because 21001331302933 - 2⁴¹ = 18802308047381 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21001331302895 and 21001331302904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21001331303933) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10500665651466 + 10500665651467.

It is an arithmetic number, because the mean of its divisors is an integer number (10500665651467).

Almost surely, 2^{21001331302933} is an apocalyptic number.

It is an amenable number.

21001331302933 is a deficient number, since it is larger than the sum of its proper divisors (1).

21001331302933 is an equidigital number, since it uses as much as digits as its factorization.

21001331302933 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8748, while the sum is 31.

Adding to 21001331302933 its reverse (33920313310012), we get a palindrome (54921644612945).

The spelling of 21001331302933 in words is "twenty-one trillion, one billion, three hundred thirty-one million, three hundred two thousand, nine hundred thirty-three".