21001513733 has 4 divisors (see below), whose sum is σ = 21009621888. Its totient is φ = 20993405580.

The previous prime is 21001513727. The next prime is 21001513801. The reversal of 21001513733 is 33731510012.

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 21001513733 - 2⁴ = 21001513717 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21001513433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4050191 + ... + 4055372.

It is an arithmetic number, because the mean of its divisors is an integer number (5252405472).

Almost surely, 2^21001513733 is an apocalyptic number.

It is an amenable number.

21001513733 is a deficient number, since it is larger than the sum of its proper divisors (8108155).

21001513733 is an equidigital number, since it uses as much as digits as its factorization.

21001513733 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8108154.

The product of its (nonzero) digits is 1890, while the sum is 26.

The spelling of 21001513733 in words is "twenty-one billion, one million, five hundred thirteen thousand, seven hundred thirty-three".