21331100033 has 2 divisors, whose sum is σ = 21331100034. Its totient is φ = 21331100032.

The previous prime is 21331100023. The next prime is 21331100039. The reversal of 21331100033 is 33000113312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 14440107889 + 6890992144 = 120167^2 + 83012^2 .

It is a cyclic number.

It is not a de Polignac number, because 21331100033 - 2²² = 21326905729 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 21331099984 and 21331100020.

It is not a weakly prime, because it can be changed into another prime (21331100039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10665550016 + 10665550017.

It is an arithmetic number, because the mean of its divisors is an integer number (10665550017).

Almost surely, 2^21331100033 is an apocalyptic number.

It is an amenable number.

21331100033 is a deficient number, since it is larger than the sum of its proper divisors (1).

21331100033 is an equidigital number, since it uses as much as digits as its factorization.

21331100033 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 162, while the sum is 17.

Adding to 21331100033 its reverse (33000113312), we get a palindrome (54331213345).

The spelling of 21331100033 in words is "twenty-one billion, three hundred thirty-one million, one hundred thousand, thirty-three".