21289522 has 8 divisors (see below), whose sum is σ = 32015916. Its totient is φ = 10617552.

The previous prime is 21289511. The next prime is 21289523. The reversal of 21289522 is 22598212.

It can be written as a sum of positive squares in 2 ways, for example, as 20331081 + 958441 = 4509^2 + 979^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21289523) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 12613 + ... + 14200.

Almost surely, 2^21289522 is an apocalyptic number.

21289522 is a deficient number, since it is larger than the sum of its proper divisors (10726394).

21289522 is a wasteful number, since it uses less digits than its factorization.

21289522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27212.

The product of its digits is 5760, while the sum is 31.

The square root of 21289522 is about 4614.0570000814. The cubic root of 21289522 is about 277.1545228630.

The spelling of 21289522 in words is "twenty-one million, two hundred eighty-nine thousand, five hundred twenty-two".