21213100333 has 4 divisors (see below), whose sum is σ = 21291377728. Its totient is φ = 21134822940.

The previous prime is 21213100313. The next prime is 21213100379. The reversal of 21213100333 is 33300131212.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21213100333 - 2⁹ = 21213099821 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21213100333.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21213100313) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 39138291 + ... + 39138832.

It is an arithmetic number, because the mean of its divisors is an integer number (5322844432).

Almost surely, 2^21213100333 is an apocalyptic number.

It is an amenable number.

21213100333 is a deficient number, since it is larger than the sum of its proper divisors (78277395).

21213100333 is an equidigital number, since it uses as much as digits as its factorization.

21213100333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78277394.

The product of its (nonzero) digits is 324, while the sum is 19.

Adding to 21213100333 its reverse (33300131212), we get a palindrome (54513231545).

The spelling of 21213100333 in words is "twenty-one billion, two hundred thirteen million, one hundred thousand, three hundred thirty-three".