21141644 has 12 divisors (see below), whose sum is σ = 37077264. Its totient is φ = 10548144.

The previous prime is 21141641. The next prime is 21141707. The reversal of 21141644 is 44614112.

It is a happy number.

It is a super-2 number, since 2×21141644² = 893938222045472, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (21141641) 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, 3479 + ... + 7374.

It is an arithmetic number, because the mean of its divisors is an integer number (3089772).

Almost surely, 2^21141644 is an apocalyptic number.

It is an amenable number.

21141644 is a deficient number, since it is larger than the sum of its proper divisors (15935620).

21141644 is a wasteful number, since it uses less digits than its factorization.

21141644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11344 (or 11342 counting only the distinct ones).

The product of its digits is 768, while the sum is 23.

The square root of 21141644 is about 4598.0043497152. The cubic root of 21141644 is about 276.5113219631.

Adding to 21141644 its reverse (44614112), we get a palindrome (65755756).

The spelling of 21141644 in words is "twenty-one million, one hundred forty-one thousand, six hundred forty-four".