21520002223333 has 2 divisors, whose sum is σ = 21520002223334. Its totient is φ = 21520002223332.

The previous prime is 21520002223303. The next prime is 21520002223337. The reversal of 21520002223333 is 33332220002512.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19254034995364 + 2265967227969 = 4387942^2 + 1505313^2 .

It is a cyclic number.

It is not a de Polignac number, because 21520002223333 - 2²¹ = 21520000126181 is a prime.

It is a super-2 number, since 2×21520002223333² (a number of 27 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21520002223337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10760001111666 + 10760001111667.

It is an arithmetic number, because the mean of its divisors is an integer number (10760001111667).

Almost surely, 2^{21520002223333} is an apocalyptic number.

It is an amenable number.

21520002223333 is a deficient number, since it is larger than the sum of its proper divisors (1).

21520002223333 is an equidigital number, since it uses as much as digits as its factorization.

21520002223333 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 28.

Adding to 21520002223333 its reverse (33332220002512), we get a palindrome (54852222225845).

The spelling of 21520002223333 in words is "twenty-one trillion, five hundred twenty billion, two million, two hundred twenty-three thousand, three hundred thirty-three".