21133553035313 has 2 divisors, whose sum is σ = 21133553035314. Its totient is φ = 21133553035312.

The previous prime is 21133553035297. The next prime is 21133553035349. The reversal of 21133553035313 is 31353035533112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19342685473024 + 1790867562289 = 4398032^2 + 1338233^2 .

It is a cyclic number.

It is not a de Polignac number, because 21133553035313 - 2⁴ = 21133553035297 is a prime.

It is not a weakly prime, because it can be changed into another prime (21133553035373) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10566776517656 + 10566776517657.

It is an arithmetic number, because the mean of its divisors is an integer number (10566776517657).

Almost surely, 2^{21133553035313} is an apocalyptic number.

It is an amenable number.

21133553035313 is a deficient number, since it is larger than the sum of its proper divisors (1).

21133553035313 is an equidigital number, since it uses as much as digits as its factorization.

21133553035313 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 182250, while the sum is 38.

Adding to 21133553035313 its reverse (31353035533112), we get a palindrome (52486588568425).

The spelling of 21133553035313 in words is "twenty-one trillion, one hundred thirty-three billion, five hundred fifty-three million, thirty-five thousand, three hundred thirteen".