21133603553515 has 4 divisors (see below), whose sum is σ = 25360324264224. Its totient is φ = 16906882842808.

The previous prime is 21133603553507. The next prime is 21133603553537. The reversal of 21133603553515 is 51535530633112.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21133603553515 - 2³ = 21133603553507 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2113360355347 + ... + 2113360355356.

It is an arithmetic number, because the mean of its divisors is an integer number (6340081066056).

Almost surely, 2^{21133603553515} is an apocalyptic number.

21133603553515 is a deficient number, since it is larger than the sum of its proper divisors (4226720710709).

21133603553515 is an equidigital number, since it uses as much as digits as its factorization.

21133603553515 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4226720710708.

The product of its (nonzero) digits is 607500, while the sum is 43.

The spelling of 21133603553515 in words is "twenty-one trillion, one hundred thirty-three billion, six hundred three million, five hundred fifty-three thousand, five hundred fifteen".