21349043 has 2 divisors, whose sum is σ = 21349044. Its totient is φ = 21349042.

The previous prime is 21349033. The next prime is 21349051. The reversal of 21349043 is 34094312.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21349043 is a prime.

It is a Sophie Germain prime.

It is equal to p_1350638 and since 21349043 and 1350638 have the same sum of digits, it is a Honaker prime.

It is not a weakly prime, because it can be changed into another prime (21349033) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10674521 + 10674522.

It is an arithmetic number, because the mean of its divisors is an integer number (10674522).

Almost surely, 2^21349043 is an apocalyptic number.

21349043 is a deficient number, since it is larger than the sum of its proper divisors (1).

21349043 is an equidigital number, since it uses as much as digits as its factorization.

21349043 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2592, while the sum is 26.

The square root of 21349043 is about 4620.5024618541. The cubic root of 21349043 is about 277.4125710021.

The spelling of 21349043 in words is "twenty-one million, three hundred forty-nine thousand, forty-three".