21034407 has 8 divisors (see below), whose sum is σ = 28069360. Its totient is φ = 14011200.

The previous prime is 21034369. The next prime is 21034411. The reversal of 21034407 is 70443012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 21034407 - 2²⁰ = 19985831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a 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 in 7 ways as a sum of consecutive naturals, for example, 2907 + ... + 7107.

It is an arithmetic number, because the mean of its divisors is an integer number (3508670).

Almost surely, 2^21034407 is an apocalyptic number.

21034407 is a deficient number, since it is larger than the sum of its proper divisors (7034953).

21034407 is a wasteful number, since it uses less digits than its factorization.

21034407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5873.

The product of its (nonzero) digits is 672, while the sum is 21.

The square root of 21034407 is about 4586.3282699781. The cubic root of 21034407 is about 276.0430120952.

Adding to 21034407 its reverse (70443012), we get a palindrome (91477419).

The spelling of 21034407 in words is "twenty-one million, thirty-four thousand, four hundred seven".