21441143 has 4 divisors (see below), whose sum is σ = 21517728. Its totient is φ = 21364560.

The previous prime is 21441137. The next prime is 21441169. The reversal of 21441143 is 34114412.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21441143 - 2¹⁰ = 21440119 is a prime.

It is a super-2 number, since 2×21441143² = 919445226292898, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21441103) 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, 37871 + ... + 38432.

It is an arithmetic number, because the mean of its divisors is an integer number (5379432).

Almost surely, 2^21441143 is an apocalyptic number.

21441143 is a deficient number, since it is larger than the sum of its proper divisors (76585).

21441143 is an equidigital number, since it uses as much as digits as its factorization.

21441143 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76584.

The product of its digits is 384, while the sum is 20.

The square root of 21441143 is about 4630.4581846724. The cubic root of 21441143 is about 277.8109189910.

Adding to 21441143 its reverse (34114412), we get a palindrome (55555555).

The spelling of 21441143 in words is "twenty-one million, four hundred forty-one thousand, one hundred forty-three".