21186274 has 8 divisors (see below), whose sum is σ = 32638428. Its totient is φ = 10306800.

The previous prime is 21186259. The next prime is 21186281. The reversal of 21186274 is 47268112.

It can be written as a sum of positive squares in 2 ways, for example, as 20475625 + 710649 = 4525^2 + 843^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 143077 + ... + 143224.

Almost surely, 2^21186274 is an apocalyptic number.

21186274 is a deficient number, since it is larger than the sum of its proper divisors (11452154).

21186274 is a wasteful number, since it uses less digits than its factorization.

21186274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 286340.

The product of its digits is 5376, while the sum is 31.

The square root of 21186274 is about 4602.8549835944. The cubic root of 21186274 is about 276.7057569644.

The spelling of 21186274 in words is "twenty-one million, one hundred eighty-six thousand, two hundred seventy-four".