21393307 has 8 divisors (see below), whose sum is σ = 23355584. Its totient is φ = 19476288.

The previous prime is 21393299. The next prime is 21393313. The reversal of 21393307 is 70339312.

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

It is not a de Polignac number, because 21393307 - 2³ = 21393299 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21393367) 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, 10323 + ... + 12220.

It is an arithmetic number, because the mean of its divisors is an integer number (2919448).

Almost surely, 2^21393307 is an apocalyptic number.

21393307 is a deficient number, since it is larger than the sum of its proper divisors (1962277).

21393307 is a wasteful number, since it uses less digits than its factorization.

21393307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22629.

The product of its (nonzero) digits is 3402, while the sum is 28.

The square root of 21393307 is about 4625.2899368580. The cubic root of 21393307 is about 277.6041629362.

The spelling of 21393307 in words is "twenty-one million, three hundred ninety-three thousand, three hundred seven".