21116485 has 8 divisors (see below), whose sum is σ = 27289080. Its totient is φ = 15593664.

The previous prime is 21116479. The next prime is 21116503. The reversal of 21116485 is 58461112.

It can be written as a sum of positive squares in 4 ways, for example, as 2505889 + 18610596 = 1583^2 + 4314^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21116485 - 2³ = 21116477 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 162370 + ... + 162499.

It is an arithmetic number, because the mean of its divisors is an integer number (3411135).

Almost surely, 2^21116485 is an apocalyptic number.

It is an amenable number.

21116485 is a deficient number, since it is larger than the sum of its proper divisors (6172595).

21116485 is a wasteful number, since it uses less digits than its factorization.

21116485 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324887.

The product of its digits is 1920, while the sum is 28.

The square root of 21116485 is about 4595.2676744669. The cubic root of 21116485 is about 276.4015936668.

Adding to 21116485 its reverse (58461112), we get a palindrome (79577597).

The spelling of 21116485 in words is "twenty-one million, one hundred sixteen thousand, four hundred eighty-five".