21279194 has 8 divisors (see below), whose sum is σ = 31943028. Its totient is φ = 10631520.

The previous prime is 21279187. The next prime is 21279199. The reversal of 21279194 is 49197212.

It can be written as a sum of positive squares in 2 ways, for example, as 20367169 + 912025 = 4513^2 + 955^2 .

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

It is not an unprimeable number, because it can be changed into a prime (21279199) 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, 104 + ... + 6524.

Almost surely, 2^21279194 is an apocalyptic number.

21279194 is a deficient number, since it is larger than the sum of its proper divisors (10663834).

21279194 is a wasteful number, since it uses less digits than its factorization.

21279194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8080.

The product of its digits is 9072, while the sum is 35.

The square root of 21279194 is about 4612.9376757117. The cubic root of 21279194 is about 277.1096977621.

The spelling of 21279194 in words is "twenty-one million, two hundred seventy-nine thousand, one hundred ninety-four".