21116277 has 96 divisors (see below), whose sum is σ = 41932800. Its totient is φ = 9922176.

The previous prime is 21116273. The next prime is 21116281. The reversal of 21116277 is 77261112.

21116277 is a `hidden beast` number, since 21 + 11 + 627 + 7 = 666.

It is an interprime number because it is at equal distance from previous prime (21116273) and next prime (21116281).

It is not a de Polignac number, because 21116277 - 2² = 21116273 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21116277.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21116273) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 357874 + ... + 357932.

It is an arithmetic number, because the mean of its divisors is an integer number (436800).

Almost surely, 2^21116277 is an apocalyptic number.

It is an amenable number.

21116277 is a deficient number, since it is larger than the sum of its proper divisors (20816523).

21116277 is a wasteful number, since it uses less digits than its factorization.

21116277 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127 (or 124 counting only the distinct ones).

The product of its digits is 1176, while the sum is 27.

The square root of 21116277 is about 4595.2450424324. The cubic root of 21116277 is about 276.4006861338.

Adding to 21116277 its reverse (77261112), we get a palindrome (98377389).

The spelling of 21116277 in words is "twenty-one million, one hundred sixteen thousand, two hundred seventy-seven".