21465533 has 4 divisors (see below), whose sum is σ = 21573600. Its totient is φ = 21357468.

The previous prime is 21465523. The next prime is 21465541. The reversal of 21465533 is 33556412.

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 21465533 - 2⁴ = 21465517 is a prime.

It is a Duffinian number.

It is a plaindrome in base 16.

It is a junction number, because it is equal to n+sod(n) for n = 21465496 and 21465505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21465503) 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, 53735 + ... + 54132.

It is an arithmetic number, because the mean of its divisors is an integer number (5393400).

Almost surely, 2^21465533 is an apocalyptic number.

It is an amenable number.

21465533 is a deficient number, since it is larger than the sum of its proper divisors (108067).

21465533 is a wasteful number, since it uses less digits than its factorization.

21465533 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108066.

The product of its digits is 10800, while the sum is 29.

The square root of 21465533 is about 4633.0910847943. The cubic root of 21465533 is about 277.9162187365.

The spelling of 21465533 in words is "twenty-one million, four hundred sixty-five thousand, five hundred thirty-three".