21525022 has 4 divisors (see below), whose sum is σ = 32287536. Its totient is φ = 10762510.

The previous prime is 21525017. The next prime is 21525059. The reversal of 21525022 is 22052512.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5381254 + ... + 5381257.

It is an arithmetic number, because the mean of its divisors is an integer number (8071884).

Almost surely, 2^21525022 is an apocalyptic number.

21525022 is a deficient number, since it is larger than the sum of its proper divisors (10762514).

21525022 is a wasteful number, since it uses less digits than its factorization.

21525022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10762513.

The product of its (nonzero) digits is 400, while the sum is 19.

The square root of 21525022 is about 4639.5066548072. The cubic root of 21525022 is about 278.1727184378.

Adding to 21525022 its reverse (22052512), we get a palindrome (43577534).

The spelling of 21525022 in words is "twenty-one million, five hundred twenty-five thousand, twenty-two".