21069173 has 8 divisors (see below), whose sum is σ = 22161408. Its totient is φ = 19991664.

The previous prime is 21069163. The next prime is 21069199. The reversal of 21069173 is 37196012.

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 21069173 - 2¹⁰ = 21068149 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21069163) 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, 686 + ... + 6527.

It is an arithmetic number, because the mean of its divisors is an integer number (2770176).

Almost surely, 2^21069173 is an apocalyptic number.

21069173 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

21069173 is a deficient number, since it is larger than the sum of its proper divisors (1092235).

21069173 is a wasteful number, since it uses less digits than its factorization.

21069173 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7363.

The product of its (nonzero) digits is 2268, while the sum is 29.

The square root of 21069173 is about 4590.1168830434. The cubic root of 21069173 is about 276.1950111334.

The spelling of 21069173 in words is "twenty-one million, sixty-nine thousand, one hundred seventy-three".