21116484 has 48 divisors (see below), whose sum is σ = 57133440. Its totient is φ = 6732000.

The previous prime is 21116479. The next prime is 21116503. The reversal of 21116484 is 48461112.

It is a happy number.

21116484 is a `hidden beast` number, since 2 + 1 + 11 + 648 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1767 + ... + 6734.

It is an arithmetic number, because the mean of its divisors is an integer number (1190280).

Almost surely, 2^21116484 is an apocalyptic number.

It is an amenable number.

21116484 is an abundant number, since it is smaller than the sum of its proper divisors (36016956).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21116484 is a wasteful number, since it uses less digits than its factorization.

21116484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8537 (or 8529 counting only the distinct ones).

The product of its digits is 1536, while the sum is 27.

The square root of 21116484 is about 4595.2675656593. The cubic root of 21116484 is about 276.4015893037.

Adding to 21116484 its reverse (48461112), we get a palindrome (69577596).

The spelling of 21116484 in words is "twenty-one million, one hundred sixteen thousand, four hundred eighty-four".