21070339 has 4 divisors (see below), whose sum is σ = 21086800. Its totient is φ = 21053880.

The previous prime is 21070337. The next prime is 21070349. The reversal of 21070339 is 93307012.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 21070339 - 2¹ = 21070337 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21070337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6132 + ... + 8929.

It is an arithmetic number, because the mean of its divisors is an integer number (5271700).

Almost surely, 2^21070339 is an apocalyptic number.

21070339 is a deficient number, since it is larger than the sum of its proper divisors (16461).

21070339 is a wasteful number, since it uses less digits than its factorization.

21070339 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16460.

The product of its (nonzero) digits is 1134, while the sum is 25.

The square root of 21070339 is about 4590.2438933024. The cubic root of 21070339 is about 276.2001060564.

The spelling of 21070339 in words is "twenty-one million, seventy thousand, three hundred thirty-nine".