21339807 has 8 divisors (see below), whose sum is σ = 28484400. Its totient is φ = 14210880.

The previous prime is 21339781. The next prime is 21339809. The reversal of 21339807 is 70893312.

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

It is not a de Polignac number, because 21339807 - 2¹⁰ = 21338783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21339809) 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, 244 + ... + 6537.

It is an arithmetic number, because the mean of its divisors is an integer number (3560550).

Almost surely, 2^21339807 is an apocalyptic number.

21339807 is a deficient number, since it is larger than the sum of its proper divisors (7144593).

21339807 is a wasteful number, since it uses less digits than its factorization.

21339807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7833.

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 21339807 is about 4619.5028953341. The cubic root of 21339807 is about 277.3725605891.

The spelling of 21339807 in words is "twenty-one million, three hundred thirty-nine thousand, eight hundred seven".