21350307 has 8 divisors (see below), whose sum is σ = 31055040. Its totient is φ = 12939560.

The previous prime is 21350291. The next prime is 21350309. The reversal of 21350307 is 70305312.

It is a happy number.

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 21350307 - 2⁴ = 21350291 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21350309) 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, 323457 + ... + 323522.

It is an arithmetic number, because the mean of its divisors is an integer number (3881880).

Almost surely, 2^21350307 is an apocalyptic number.

21350307 is a deficient number, since it is larger than the sum of its proper divisors (9704733).

21350307 is a wasteful number, since it uses less digits than its factorization.

21350307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 646993.

The product of its (nonzero) digits is 630, while the sum is 21.

The square root of 21350307 is about 4620.6392414903. The cubic root of 21350307 is about 277.4180457606.

Adding to 21350307 its reverse (70305312), we get a palindrome (91655619).

The spelling of 21350307 in words is "twenty-one million, three hundred fifty thousand, three hundred seven".