21012001010233 has 2 divisors, whose sum is σ = 21012001010234. Its totient is φ = 21012001010232.

The previous prime is 21012001010183. The next prime is 21012001010239. The reversal of 21012001010233 is 33201010021012.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20317258756089 + 694742254144 = 4507467^2 + 833512^2 .

It is a cyclic number.

It is not a de Polignac number, because 21012001010233 - 2³³ = 21003411075641 is a prime.

It is a super-2 number, since 2×21012001010233² (a number of 27 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21012001010239) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10506000505116 + 10506000505117.

It is an arithmetic number, because the mean of its divisors is an integer number (10506000505117).

Almost surely, 2^{21012001010233} is an apocalyptic number.

It is an amenable number.

21012001010233 is a deficient number, since it is larger than the sum of its proper divisors (1).

21012001010233 is an equidigital number, since it uses as much as digits as its factorization.

21012001010233 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 21012001010233 its reverse (33201010021012), we get a palindrome (54213011031245).

The spelling of 21012001010233 in words is "twenty-one trillion, twelve billion, one million, ten thousand, two hundred thirty-three".