21112245 has 80 divisors (see below), whose sum is σ = 47253888. Its totient is φ = 8760960.

The previous prime is 21112241. The next prime is 21112279. The reversal of 21112245 is 54221112.

It is not a de Polignac number, because 21112245 - 2² = 21112241 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21112241) 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 79 ways as a sum of consecutive naturals, for example, 30847 + ... + 31523.

Almost surely, 2^21112245 is an apocalyptic number.

It is an amenable number.

21112245 is an abundant number, since it is smaller than the sum of its proper divisors (26141643).

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

21112245 is a wasteful number, since it uses less digits than its factorization.

21112245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 703 counting only the distinct ones).

The product of its digits is 160, while the sum is 18.

The square root of 21112245 is about 4594.8063071255. The cubic root of 21112245 is about 276.3830927783.

Adding to 21112245 its reverse (54221112), we get a palindrome (75333357).

It can be divided in two parts, 2111 and 2245, that added together give a square (4356 = 66²).

The spelling of 21112245 in words is "twenty-one million, one hundred twelve thousand, two hundred forty-five".