21420310333 has 4 divisors (see below), whose sum is σ = 21456802080. Its totient is φ = 21383818588.

The previous prime is 21420310319. The next prime is 21420310399. The reversal of 21420310333 is 33301302412.

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 a de Polignac number, because none of the positive numbers 2^k-21420310333 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21420310133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18244993 + ... + 18246166.

It is an arithmetic number, because the mean of its divisors is an integer number (5364200520).

Almost surely, 2^21420310333 is an apocalyptic number.

It is an amenable number.

21420310333 is a deficient number, since it is larger than the sum of its proper divisors (36491747).

21420310333 is an equidigital number, since it uses as much as digits as its factorization.

21420310333 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36491746.

The product of its (nonzero) digits is 1296, while the sum is 22.

Adding to 21420310333 its reverse (33301302412), we get a palindrome (54721612745).

The spelling of 21420310333 in words is "twenty-one billion, four hundred twenty million, three hundred ten thousand, three hundred thirty-three".