21671193 has 4 divisors (see below), whose sum is σ = 28894928. Its totient is φ = 14447460.

The previous prime is 21671179. The next prime is 21671197. The reversal of 21671193 is 39117612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 21671193 - 2⁵ = 21671161 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 21671193.

It is not an unprimeable number, because it can be changed into a prime (21671197) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3611863 + ... + 3611868.

It is an arithmetic number, because the mean of its divisors is an integer number (7223732).

Almost surely, 2^21671193 is an apocalyptic number.

It is an amenable number.

21671193 is a deficient number, since it is larger than the sum of its proper divisors (7223735).

21671193 is an equidigital number, since it uses as much as digits as its factorization.

21671193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7223734.

The product of its digits is 2268, while the sum is 30.

The square root of 21671193 is about 4655.2328620596. The cubic root of 21671193 is about 278.8009654309.

The spelling of 21671193 in words is "twenty-one million, six hundred seventy-one thousand, one hundred ninety-three".