21069039 has 8 divisors (see below), whose sum is σ = 28777392. Its totient is φ = 13703360.

The previous prime is 21069031. The next prime is 21069073. The reversal of 21069039 is 93096012.

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 21069039 - 2³ = 21069031 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21068997 and 21069015.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21069031) 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, 85524 + ... + 85769.

It is an arithmetic number, because the mean of its divisors is an integer number (3597174).

Almost surely, 2^21069039 is an apocalyptic number.

21069039 is a deficient number, since it is larger than the sum of its proper divisors (7708353).

21069039 is a wasteful number, since it uses less digits than its factorization.

21069039 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171337.

The product of its (nonzero) digits is 2916, while the sum is 30.

The square root of 21069039 is about 4590.1022864420. The cubic root of 21069039 is about 276.1944255985.

The spelling of 21069039 in words is "twenty-one million, sixty-nine thousand, thirty-nine".