21530562 has 8 divisors (see below), whose sum is σ = 43061136. Its totient is φ = 7176852.

The previous prime is 21530543. The next prime is 21530563. The reversal of 21530562 is 26503512.

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

21530562 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (21530563) 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, 1794208 + ... + 1794219.

It is an arithmetic number, because the mean of its divisors is an integer number (5382642).

Almost surely, 2^21530562 is an apocalyptic number.

21530562 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21530562 is a wasteful number, since it uses less digits than its factorization.

21530562 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3588432.

The product of its (nonzero) digits is 1800, while the sum is 24.

The square root of 21530562 is about 4640.1036626351. The cubic root of 21530562 is about 278.1965812809.

The spelling of 21530562 in words is "twenty-one million, five hundred thirty thousand, five hundred sixty-two".