21541244 has 12 divisors (see below), whose sum is σ = 39914784. Its totient is φ = 10137024.

The previous prime is 21541241. The next prime is 21541259. The reversal of 21541244 is 44214512.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21541241) 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, 158324 + ... + 158459.

It is an arithmetic number, because the mean of its divisors is an integer number (3326232).

Almost surely, 2^21541244 is an apocalyptic number.

It is an amenable number.

21541244 is a deficient number, since it is larger than the sum of its proper divisors (18373540).

21541244 is a wasteful number, since it uses less digits than its factorization.

21541244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 316804 (or 316802 counting only the distinct ones).

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

The square root of 21541244 is about 4641.2545717726. The cubic root of 21541244 is about 278.2425810798.

Adding to 21541244 its reverse (44214512), we get a palindrome (65755756).

The spelling of 21541244 in words is "twenty-one million, five hundred forty-one thousand, two hundred forty-four".