21033515053 has 2 divisors, whose sum is σ = 21033515054. Its totient is φ = 21033515052.

The previous prime is 21033515051. The next prime is 21033515099. The reversal of 21033515053 is 35051533012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20972253124 + 61261929 = 144818^2 + 7827^2 .

It is a cyclic number.

It is not a de Polignac number, because 21033515053 - 2¹ = 21033515051 is a prime.

Together with 21033515051, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21033515051) 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, 10516757526 + 10516757527.

It is an arithmetic number, because the mean of its divisors is an integer number (10516757527).

Almost surely, 2^21033515053 is an apocalyptic number.

It is an amenable number.

21033515053 is a deficient number, since it is larger than the sum of its proper divisors (1).

21033515053 is an equidigital number, since it uses as much as digits as its factorization.

21033515053 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6750, while the sum is 28.

The spelling of 21033515053 in words is "twenty-one billion, thirty-three million, five hundred fifteen thousand, fifty-three".