21241144 has 32 divisors (see below), whose sum is σ = 42203520. Its totient is φ = 10001376.

The previous prime is 21241123. The next prime is 21241147. The reversal of 21241144 is 44114212.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21241147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11467 + ... + 13189.

It is an arithmetic number, because the mean of its divisors is an integer number (1318860).

Almost surely, 2^21241144 is an apocalyptic number.

It is an amenable number.

21241144 is a deficient number, since it is larger than the sum of its proper divisors (20962376).

21241144 is a wasteful number, since it uses less digits than its factorization.

21241144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1819 (or 1815 counting only the distinct ones).

The product of its digits is 256, while the sum is 19.

The square root of 21241144 is about 4608.8115604785. The cubic root of 21241144 is about 276.9444296767.

Adding to 21241144 its reverse (44114212), we get a palindrome (65355356).

It can be divided in two parts, 21 and 241144, that added together give a triangular number (241165 = T₆₉₄).

The spelling of 21241144 in words is "twenty-one million, two hundred forty-one thousand, one hundred forty-four".