21141443 has 4 divisors (see below), whose sum is σ = 21152328. Its totient is φ = 21130560.

The previous prime is 21141437. The next prime is 21141451. The reversal of 21141443 is 34414112.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 21141443 - 2¹⁶ = 21075907 is a prime.

It is a super-2 number, since 2×21141443² = 893921224244498, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21141403) 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, 1646 + ... + 6707.

It is an arithmetic number, because the mean of its divisors is an integer number (5288082).

Almost surely, 2^21141443 is an apocalyptic number.

21141443 is a deficient number, since it is larger than the sum of its proper divisors (10885).

21141443 is an equidigital number, since it uses as much as digits as its factorization.

21141443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10884.

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

The square root of 21141443 is about 4597.9824923547. The cubic root of 21141443 is about 276.5104456681.

Adding to 21141443 its reverse (34414112), we get a palindrome (55555555).

The spelling of 21141443 in words is "twenty-one million, one hundred forty-one thousand, four hundred forty-three".