21528014 has 8 divisors (see below), whose sum is σ = 32332440. Its totient is φ = 10750536.

The previous prime is 21528011. The next prime is 21528037. The reversal of 21528014 is 41082512.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21528011) 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, 4604 + ... + 8015.

It is an arithmetic number, because the mean of its divisors is an integer number (4041555).

Almost surely, 2^21528014 is an apocalyptic number.

21528014 is a deficient number, since it is larger than the sum of its proper divisors (10804426).

21528014 is a wasteful number, since it uses less digits than its factorization.

21528014 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13474.

The product of its (nonzero) digits is 640, while the sum is 23.

The square root of 21528014 is about 4639.8290916800. The cubic root of 21528014 is about 278.1856066045.

The spelling of 21528014 in words is "twenty-one million, five hundred twenty-eight thousand, fourteen".