21421444333 has 2 divisors, whose sum is σ = 21421444334. Its totient is φ = 21421444332.

The previous prime is 21421444327. The next prime is 21421444349. The reversal of 21421444333 is 33344412412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11684096649 + 9737347684 = 108093^2 + 98678^2 .

It is a cyclic number.

It is not a de Polignac number, because 21421444333 - 2³³ = 12831509741 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21421444295 and 21421444304.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21421441333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10710722166 + 10710722167.

It is an arithmetic number, because the mean of its divisors is an integer number (10710722167).

Almost surely, 2^21421444333 is an apocalyptic number.

It is an amenable number.

21421444333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21421444333 is an equidigital number, since it uses as much as digits as its factorization.

21421444333 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27648, while the sum is 31.

Adding to 21421444333 its reverse (33344412412), we get a palindrome (54765856745).

The spelling of 21421444333 in words is "twenty-one billion, four hundred twenty-one million, four hundred forty-four thousand, three hundred thirty-three".