21076943 has 2 divisors, whose sum is σ = 21076944. Its totient is φ = 21076942.

The previous prime is 21076933. The next prime is 21076949. The reversal of 21076943 is 34967012.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 21076943 - 2⁶ = 21076879 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is an alternating number because its digits alternate between even and odd.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21076949) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10538471 + 10538472.

It is an arithmetic number, because the mean of its divisors is an integer number (10538472).

Almost surely, 2^21076943 is an apocalyptic number.

21076943 is a deficient number, since it is larger than the sum of its proper divisors (1).

21076943 is an equidigital number, since it uses as much as digits as its factorization.

21076943 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9072, while the sum is 32.

The square root of 21076943 is about 4590.9631887002. The cubic root of 21076943 is about 276.2289591749.

The spelling of 21076943 in words is "twenty-one million, seventy-six thousand, nine hundred forty-three".