21202100033 has 2 divisors, whose sum is σ = 21202100034. Its totient is φ = 21202100032.

The previous prime is 21202099987. The next prime is 21202100089. The reversal of 21202100033 is 33000120212.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19463877169 + 1738222864 = 139513^2 + 41692^2 .

It is a cyclic number.

It is not a de Polignac number, because 21202100033 - 2⁸ = 21202099777 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21202099990 and 21202100017.

It is not a weakly prime, because it can be changed into another prime (21202100093) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10601050016 + 10601050017.

It is an arithmetic number, because the mean of its divisors is an integer number (10601050017).

Almost surely, 2^21202100033 is an apocalyptic number.

It is an amenable number.

21202100033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21202100033 is an equidigital number, since it uses as much as digits as its factorization.

21202100033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 72, while the sum is 14.

Adding to 21202100033 its reverse (33000120212), we get a palindrome (54202220245).

The spelling of 21202100033 in words is "twenty-one billion, two hundred two million, one hundred thousand, thirty-three".