21034411 has 2 divisors, whose sum is σ = 21034412. Its totient is φ = 21034410.

The previous prime is 21034369. The next prime is 21034417. The reversal of 21034411 is 11443012.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21034411 is a prime.

It is a super-2 number, since 2×21034411² = 884892892233842, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (21034417) 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, 10517205 + 10517206.

It is an arithmetic number, because the mean of its divisors is an integer number (10517206).

Almost surely, 2^21034411 is an apocalyptic number.

21034411 is a deficient number, since it is larger than the sum of its proper divisors (1).

21034411 is an equidigital number, since it uses as much as digits as its factorization.

21034411 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 21034411 is about 4586.3287060567. The cubic root of 21034411 is about 276.0430295930.

Adding to 21034411 its reverse (11443012), we get a palindrome (32477423).

The spelling of 21034411 in words is "twenty-one million, thirty-four thousand, four hundred eleven".