21084274 has 8 divisors (see below), whose sum is σ = 31664880. Its totient is φ = 10529316.

The previous prime is 21084269. The next prime is 21084289. The reversal of 21084274 is 47248012.

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

It is a super-2 number, since 2×21084274² = 889093220214152, which contains 22 as substring.

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, 4204 + ... + 7735.

It is an arithmetic number, because the mean of its divisors is an integer number (3958110).

Almost surely, 2^21084274 is an apocalyptic number.

21084274 is a deficient number, since it is larger than the sum of its proper divisors (10580606).

21084274 is a wasteful number, since it uses less digits than its factorization.

21084274 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12824.

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 21084274 is about 4591.7615356201. The cubic root of 21084274 is about 276.2609815253.

It can be divided in two parts, 2108427 and 4, that added together give a triangular number (2108431 = T₂₀₅₃).

The spelling of 21084274 in words is "twenty-one million, eighty-four thousand, two hundred seventy-four".