21213110333 has 2 divisors, whose sum is σ = 21213110334. Its totient is φ = 21213110332.

The previous prime is 21213110287. The next prime is 21213110363. The reversal of 21213110333 is 33301131212.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18186680164 + 3026430169 = 134858^2 + 55013^2 .

It is a cyclic number.

It is not a de Polignac number, because 21213110333 - 2³² = 16918143037 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21213110363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10606555166 + 10606555167.

It is an arithmetic number, because the mean of its divisors is an integer number (10606555167).

Almost surely, 2^21213110333 is an apocalyptic number.

It is an amenable number.

21213110333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21213110333 is an equidigital number, since it uses as much as digits as its factorization.

21213110333 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 324, while the sum is 20.

Adding to 21213110333 its reverse (33301131212), we get a palindrome (54514241545).

The spelling of 21213110333 in words is "twenty-one billion, two hundred thirteen million, one hundred ten thousand, three hundred thirty-three".