21679273 has 8 divisors (see below), whose sum is σ = 27028800. Its totient is φ = 16892880.

The previous prime is 21679249. The next prime is 21679297. The reversal of 21679273 is 37297612.

It is an interprime number because it is at equal distance from previous prime (21679249) and next prime (21679297).

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 21679273 - 2⁵ = 21679241 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21679223) 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, 140698 + ... + 140851.

It is an arithmetic number, because the mean of its divisors is an integer number (3378600).

Almost surely, 2^21679273 is an apocalyptic number.

It is an amenable number.

21679273 is a deficient number, since it is larger than the sum of its proper divisors (5349527).

21679273 is a wasteful number, since it uses less digits than its factorization.

21679273 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 281567.

The product of its digits is 31752, while the sum is 37.

The square root of 21679273 is about 4656.1006217650. The cubic root of 21679273 is about 278.8356109915.

It can be divided in two parts, 21679 and 273, that added together give a cube (21952 = 28³).

The spelling of 21679273 in words is "twenty-one million, six hundred seventy-nine thousand, two hundred seventy-three".