21034984 has 16 divisors (see below), whose sum is σ = 41760900. Its totient is φ = 9898752.

The previous prime is 21034973. The next prime is 21034997. The reversal of 21034984 is 48943012.

It can be written as a sum of positive squares in 2 ways, for example, as 18404100 + 2630884 = 4290^2 + 1622^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 77199 + ... + 77470.

Almost surely, 2^21034984 is an apocalyptic number.

It is an amenable number.

21034984 is a deficient number, since it is larger than the sum of its proper divisors (20725916).

21034984 is a wasteful number, since it uses less digits than its factorization.

21034984 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154692 (or 154688 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 21034984 is about 4586.3911738970. The cubic root of 21034984 is about 276.0455361401.

Adding to 21034984 its reverse (48943012), we get a palindrome (69977996).

The spelling of 21034984 in words is "twenty-one million, thirty-four thousand, nine hundred eighty-four".