21045529 has 8 divisors (see below), whose sum is σ = 22124160. Its totient is φ = 19980576.

The previous prime is 21045527. The next prime is 21045539. The reversal of 21045529 is 92554012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 21045529 - 2¹ = 21045527 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21045497 and 21045506.

It is not an unprimeable number, because it can be changed into a prime (21045527) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 189 + ... + 6490.

It is an arithmetic number, because the mean of its divisors is an integer number (2765520).

Almost surely, 2^21045529 is an apocalyptic number.

It is an amenable number.

21045529 is a deficient number, since it is larger than the sum of its proper divisors (1078631).

21045529 is a wasteful number, since it uses less digits than its factorization.

21045529 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6839.

The product of its (nonzero) digits is 3600, while the sum is 28.

The square root of 21045529 is about 4587.5406265231. The cubic root of 21045529 is about 276.0916563541.

The spelling of 21045529 in words is "twenty-one million, forty-five thousand, five hundred twenty-nine".