21171274 has 8 divisors (see below), whose sum is σ = 32356260. Its totient is φ = 10385856.

The previous prime is 21171253. The next prime is 21171313. The reversal of 21171274 is 47217112.

It can be written as a sum of positive squares in 2 ways, for example, as 21095649 + 75625 = 4593^2 + 275^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99759 + ... + 99970.

Almost surely, 2^21171274 is an apocalyptic number.

21171274 is a deficient number, since it is larger than the sum of its proper divisors (11184986).

21171274 is a wasteful number, since it uses less digits than its factorization.

21171274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199784.

The product of its digits is 784, while the sum is 25.

The square root of 21171274 is about 4601.2252715989. The cubic root of 21171274 is about 276.6404384743.

Adding to 21171274 its reverse (47217112), we get a palindrome (68388386).

The spelling of 21171274 in words is "twenty-one million, one hundred seventy-one thousand, two hundred seventy-four".