21141943 has 2 divisors, whose sum is σ = 21141944. Its totient is φ = 21141942.

The previous prime is 21141941. The next prime is 21141947. The reversal of 21141943 is 34914112.

It is a happy number.

21141943 is nontrivially palindromic in base 12.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21141943 - 2¹ = 21141941 is a prime.

Together with 21141941, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21141941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10570971 + 10570972.

It is an arithmetic number, because the mean of its divisors is an integer number (10570972).

Almost surely, 2^21141943 is an apocalyptic number.

21141943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21141943 is an equidigital number, since it uses as much as digits as its factorization.

21141943 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 864, while the sum is 25.

The square root of 21141943 is about 4598.0368637061. The cubic root of 21141943 is about 276.5126254962.

The spelling of 21141943 in words is "twenty-one million, one hundred forty-one thousand, nine hundred forty-three".