21133603553513 has 4 divisors (see below), whose sum is σ = 23054840240208. Its totient is φ = 19212366866820.

The previous prime is 21133603553507. The next prime is 21133603553537. The reversal of 21133603553513 is 31535530633112.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21133603553513 - 2¹⁰ = 21133603552489 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21133603553593) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 960618343331 + ... + 960618343352.

It is an arithmetic number, because the mean of its divisors is an integer number (5763710060052).

Almost surely, 2^{21133603553513} is an apocalyptic number.

It is an amenable number.

21133603553513 is a deficient number, since it is larger than the sum of its proper divisors (1921236686695).

21133603553513 is a wasteful number, since it uses less digits than its factorization.

21133603553513 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1921236686694.

The product of its (nonzero) digits is 364500, while the sum is 41.

The spelling of 21133603553513 in words is "twenty-one trillion, one hundred thirty-three billion, six hundred three million, five hundred fifty-three thousand, five hundred thirteen".