21034745 has 8 divisors (see below), whose sum is σ = 25277184. Its totient is φ = 16804144.

The previous prime is 21034733. The next prime is 21034747. The reversal of 21034745 is 54743012.

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

It is a cyclic number.

It is not a de Polignac number, because 21034745 - 2¹⁰ = 21033721 is a prime.

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

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21034747) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1592 + ... + 6678.

It is an arithmetic number, because the mean of its divisors is an integer number (3159648).

Almost surely, 2^21034745 is an apocalyptic number.

It is an amenable number.

21034745 is a deficient number, since it is larger than the sum of its proper divisors (4242439).

21034745 is an equidigital number, since it uses as much as digits as its factorization.

21034745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5919.

The product of its (nonzero) digits is 3360, while the sum is 26.

The square root of 21034745 is about 4586.3651184789. The cubic root of 21034745 is about 276.0444906574.

Adding to 21034745 its reverse (54743012), we get a palindrome (75777757).

The spelling of 21034745 in words is "twenty-one million, thirty-four thousand, seven hundred forty-five".