21214043 has 4 divisors (see below), whose sum is σ = 21249600. Its totient is φ = 21178488.

The previous prime is 21214021. The next prime is 21214049. The reversal of 21214043 is 34041212.

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 21214043 - 2¹⁸ = 20951899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21214049) 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, 16868 + ... + 18081.

It is an arithmetic number, because the mean of its divisors is an integer number (5312400).

Almost surely, 2^21214043 is an apocalyptic number.

21214043 is a deficient number, since it is larger than the sum of its proper divisors (35557).

21214043 is an equidigital number, since it uses as much as digits as its factorization.

21214043 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35556.

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 21214043 is about 4605.8704931858. The cubic root of 21214043 is about 276.8265975853.

Adding to 21214043 its reverse (34041212), we get a palindrome (55255255).

The spelling of 21214043 in words is "twenty-one million, two hundred fourteen thousand, forty-three".