21528942 has 32 divisors (see below), whose sum is σ = 44712960. Its totient is φ = 6903360.

The previous prime is 21528937. The next prime is 21529003. The reversal of 21528942 is 24982512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52434 + ... + 52842.

It is an arithmetic number, because the mean of its divisors is an integer number (1397280).

Almost surely, 2^21528942 is an apocalyptic number.

21528942 is an abundant number, since it is smaller than the sum of its proper divisors (23184018).

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

21528942 is a wasteful number, since it uses less digits than its factorization.

21528942 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 728.

The product of its digits is 11520, while the sum is 33.

The square root of 21528942 is about 4639.9290942858. The cubic root of 21528942 is about 278.1896037611.

The spelling of 21528942 in words is "twenty-one million, five hundred twenty-eight thousand, nine hundred forty-two".