21084968 has 16 divisors (see below), whose sum is σ = 40603380. Its totient is φ = 10257408.

The previous prime is 21084953. The next prime is 21084971. The reversal of 21084968 is 86948012.

It can be written as a sum of positive squares in 2 ways, for example, as 18645124 + 2439844 = 4318^2 + 1562^2 .

It is a super-2 number, since 2×21084968² = 889151751122048, 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, 35321 + ... + 35912.

Almost surely, 2^21084968 is an apocalyptic number.

It is an amenable number.

21084968 is a deficient number, since it is larger than the sum of its proper divisors (19518412).

21084968 is a wasteful number, since it uses less digits than its factorization.

21084968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71276 (or 71272 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 38.

The square root of 21084968 is about 4591.8371051247. The cubic root of 21084968 is about 276.2640125841.

The spelling of 21084968 in words is "twenty-one million, eighty-four thousand, nine hundred sixty-eight".