21300531533 has 4 divisors (see below), whose sum is σ = 22421612160. Its totient is φ = 20179450908.

The previous prime is 21300531521. The next prime is 21300531583. The reversal of 21300531533 is 33513500312.

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 21300531533 - 2¹⁴ = 21300515149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21300531503) 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, 560540285 + ... + 560540322.

It is an arithmetic number, because the mean of its divisors is an integer number (5605403040).

Almost surely, 2^21300531533 is an apocalyptic number.

It is an amenable number.

21300531533 is a deficient number, since it is larger than the sum of its proper divisors (1121080627).

21300531533 is a wasteful number, since it uses less digits than its factorization.

21300531533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1121080626.

The product of its (nonzero) digits is 4050, while the sum is 26.

The spelling of 21300531533 in words is "twenty-one billion, three hundred million, five hundred thirty-one thousand, five hundred thirty-three".