21108522 has 32 divisors (see below), whose sum is σ = 44089920. Its totient is φ = 6730880.

The previous prime is 21108497. The next prime is 21108539. The reversal of 21108522 is 22580112.

It is a happy 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, 12229 + ... + 13847.

It is an arithmetic number, because the mean of its divisors is an integer number (1377810).

Almost surely, 2^21108522 is an apocalyptic number.

21108522 is an abundant number, since it is smaller than the sum of its proper divisors (22981398).

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

21108522 is a wasteful number, since it uses less digits than its factorization.

21108522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1718.

The product of its (nonzero) digits is 320, while the sum is 21.

The square root of 21108522 is about 4594.4011579312. The cubic root of 21108522 is about 276.3668457339.

Adding to 21108522 its reverse (22580112), we get a palindrome (43688634).

The spelling of 21108522 in words is "twenty-one million, one hundred eight thousand, five hundred twenty-two".