21112150 has 12 divisors (see below), whose sum is σ = 39268692. Its totient is φ = 8444840.

The previous prime is 21112141. The next prime is 21112151. The reversal of 21112150 is 5121112.

It is a self number, because there is not a number n which added to its sum of digits gives 21112150.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112151) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 211072 + ... + 211171.

It is an arithmetic number, because the mean of its divisors is an integer number (3272391).

Almost surely, 2^21112150 is an apocalyptic number.

21112150 is a deficient number, since it is larger than the sum of its proper divisors (18156542).

21112150 is a wasteful number, since it uses less digits than its factorization.

21112150 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 422255 (or 422250 counting only the distinct ones).

The product of its (nonzero) digits is 20, while the sum is 13.

The square root of 21112150 is about 4594.7959693549. The cubic root of 21112150 is about 276.3826782253.

Adding to 21112150 its reverse (5121112), we get a palindrome (26233262).

The spelling of 21112150 in words is "twenty-one million, one hundred twelve thousand, one hundred fifty".