21034907 has 8 divisors (see below), whose sum is σ = 21660912. Its totient is φ = 20412000.

The previous prime is 21034891. The next prime is 21034943. The reversal of 21034907 is 70943012.

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 21034907 - 2⁴ = 21034891 is a prime.

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

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21034997) 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, 25532 + ... + 26342.

It is an arithmetic number, because the mean of its divisors is an integer number (2707614).

Almost surely, 2^21034907 is an apocalyptic number.

21034907 is a deficient number, since it is larger than the sum of its proper divisors (626005).

21034907 is an equidigital number, since it uses as much as digits as its factorization.

21034907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1549.

The product of its (nonzero) digits is 1512, while the sum is 26.

The square root of 21034907 is about 4586.3827794897. The cubic root of 21034907 is about 276.0451993118.

Adding to 21034907 its reverse (70943012), we get a palindrome (91977919).

The spelling of 21034907 in words is "twenty-one million, thirty-four thousand, nine hundred seven".