21401351333 has 2 divisors, whose sum is σ = 21401351334. Its totient is φ = 21401351332.

The previous prime is 21401351311. The next prime is 21401351341. The reversal of 21401351333 is 33315310412.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19412012929 + 1989338404 = 139327^2 + 44602^2 .

It is a cyclic number.

It is not a de Polignac number, because 21401351333 - 2¹⁸ = 21401089189 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21401357333) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10700675666 + 10700675667.

It is an arithmetic number, because the mean of its divisors is an integer number (10700675667).

Almost surely, 2^21401351333 is an apocalyptic number.

It is an amenable number.

21401351333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21401351333 is an equidigital number, since it uses as much as digits as its factorization.

21401351333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

Adding to 21401351333 its reverse (33315310412), we get a palindrome (54716661745).

The spelling of 21401351333 in words is "twenty-one billion, four hundred one million, three hundred fifty-one thousand, three hundred thirty-three".