21441245 has 16 divisors (see below), whose sum is σ = 29607168. Its totient is φ = 14601600.

The previous prime is 21441239. The next prime is 21441247. The reversal of 21441245 is 54214412.

It is not a de Polignac number, because 21441245 - 2⁴ = 21441229 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21441245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441247) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3257 + ... + 7313.

It is an arithmetic number, because the mean of its divisors is an integer number (1850448).

Almost surely, 2^21441245 is an apocalyptic number.

It is an amenable number.

21441245 is a deficient number, since it is larger than the sum of its proper divisors (8165923).

21441245 is a wasteful number, since it uses less digits than its factorization.

21441245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4220.

The product of its digits is 1280, while the sum is 23.

The square root of 21441245 is about 4630.4691986882. The cubic root of 21441245 is about 277.8113595252.

Adding to 21441245 its reverse (54214412), we get a palindrome (75655657).

The spelling of 21441245 in words is "twenty-one million, four hundred forty-one thousand, two hundred forty-five".