21673227 has 8 divisors (see below), whose sum is σ = 29329216. Its totient is φ = 14233032.

The previous prime is 21673219. The next prime is 21673229. The reversal of 21673227 is 72237612.

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

It is not a de Polignac number, because 21673227 - 2³ = 21673219 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21673194 and 21673203.

It is not an unprimeable number, because it can be changed into a prime (21673229) 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, 53713 + ... + 54114.

It is an arithmetic number, because the mean of its divisors is an integer number (3666152).

Almost surely, 2^21673227 is an apocalyptic number.

21673227 is a deficient number, since it is larger than the sum of its proper divisors (7655989).

21673227 is a wasteful number, since it uses less digits than its factorization.

21673227 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 107897.

The product of its digits is 7056, while the sum is 30.

The square root of 21673227 is about 4655.4513207636. The cubic root of 21673227 is about 278.8096876615.

The spelling of 21673227 in words is "twenty-one million, six hundred seventy-three thousand, two hundred twenty-seven".