21173073 has 8 divisors (see below), whose sum is σ = 28266336. Its totient is φ = 14097600.

The previous prime is 21173057. The next prime is 21173081. The reversal of 21173073 is 37037112.

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

It is not a de Polignac number, because 21173073 - 2⁴ = 21173057 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21173473) 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, 1363 + ... + 6648.

It is an arithmetic number, because the mean of its divisors is an integer number (3533292).

Almost surely, 2^21173073 is an apocalyptic number.

It is an amenable number.

21173073 is a deficient number, since it is larger than the sum of its proper divisors (7093263).

21173073 is an equidigital number, since it uses as much as digits as its factorization.

21173073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8895.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 21173073 is about 4601.4207588526. The cubic root of 21173073 is about 276.6482739664.

The spelling of 21173073 in words is "twenty-one million, one hundred seventy-three thousand, seventy-three".