21528002 has 8 divisors (see below), whose sum is σ = 32317500. Its totient is φ = 10755504.

The previous prime is 21527983. The next prime is 21528011. The reversal of 21528002 is 20082512.

It can be written as a sum of positive squares in 2 ways, for example, as 21169201 + 358801 = 4601^2 + 599^2 .

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

It is a super-2 number, since 2×21528002² = 926909740224008, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 377 + ... + 6572.

Almost surely, 2^21528002 is an apocalyptic number.

21528002 is a deficient number, since it is larger than the sum of its proper divisors (10789498).

21528002 is a wasteful number, since it uses less digits than its factorization.

21528002 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8500.

The product of its (nonzero) digits is 320, while the sum is 20.

The square root of 21528002 is about 4639.8277985287. The cubic root of 21528002 is about 278.1855549164.

The spelling of 21528002 in words is "twenty-one million, five hundred twenty-eight thousand, two".