21590112 has 24 divisors (see below), whose sum is σ = 56674296. Its totient is φ = 7196672.

The previous prime is 21590087. The next prime is 21590113. The reversal of 21590112 is 21109512.

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×21590112² = 932265872345088, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21590113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112353 + ... + 112544.

It is an arithmetic number, because the mean of its divisors is an integer number (2361429).

Almost surely, 2^21590112 is an apocalyptic number.

It is an amenable number.

21590112 is an abundant number, since it is smaller than the sum of its proper divisors (35084184).

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

21590112 is a wasteful number, since it uses less digits than its factorization.

21590112 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 224910 (or 224902 counting only the distinct ones).

The product of its (nonzero) digits is 180, while the sum is 21.

The square root of 21590112 is about 4646.5161142516. The cubic root of 21590112 is about 278.4528272061.

Adding to 21590112 its reverse (21109512), we get a palindrome (42699624).

The spelling of 21590112 in words is "twenty-one million, five hundred ninety thousand, one hundred twelve".