21528902 has 16 divisors (see below), whose sum is σ = 34314192. Its totient is φ = 10095360.

The previous prime is 21528893. The next prime is 21528929. The reversal of 21528902 is 20982512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10298 + ... + 12210.

It is an arithmetic number, because the mean of its divisors is an integer number (2144637).

Almost surely, 2^21528902 is an apocalyptic number.

21528902 is a deficient number, since it is larger than the sum of its proper divisors (12785290).

21528902 is a wasteful number, since it uses less digits than its factorization.

21528902 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 21528902 is about 4639.9247838731. The cubic root of 21528902 is about 278.1894314723.

The spelling of 21528902 in words is "twenty-one million, five hundred twenty-eight thousand, nine hundred two".