21034413 has 6 divisors (see below), whose sum is σ = 30383054. Its totient is φ = 14022936.

The previous prime is 21034411. The next prime is 21034417. The reversal of 21034413 is 31443012.

It can be written as a sum of positive squares in only one way, i.e., 20820969 + 213444 = 4563^2 + 462^2 .

It is not a de Polignac number, because 21034413 - 2¹ = 21034411 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21034411) 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 in 5 ways as a sum of consecutive naturals, for example, 1168570 + ... + 1168587.

Almost surely, 2^21034413 is an apocalyptic number.

It is an amenable number.

21034413 is a deficient number, since it is larger than the sum of its proper divisors (9348641).

21034413 is a wasteful number, since it uses less digits than its factorization.

21034413 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2337163 (or 2337160 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 21034413 is about 4586.3289240960. The cubic root of 21034413 is about 276.0430383420.

Adding to 21034413 its reverse (31443012), we get a palindrome (52477425).

The spelling of 21034413 in words is "twenty-one million, thirty-four thousand, four hundred thirteen".