21190016 has 32 divisors (see below), whose sum is σ = 44441400. Its totient is φ = 10036224.

The previous prime is 21190003. The next prime is 21190051. The reversal of 21190016 is 61009112.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 21190016.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1925 + ... + 6788.

Almost surely, 2^21190016 is an apocalyptic number.

It is an amenable number.

21190016 is an abundant number, since it is smaller than the sum of its proper divisors (23251384).

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

21190016 is an equidigital number, since it uses as much as digits as its factorization.

21190016 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8746 (or 8734 counting only the distinct ones).

The product of its (nonzero) digits is 108, while the sum is 20.

The square root of 21190016 is about 4603.2614524921. The cubic root of 21190016 is about 276.7220469451.

Adding to 21190016 its reverse (61009112), we get a palindrome (82199128).

The spelling of 21190016 in words is "twenty-one million, one hundred ninety thousand, sixteen".