21095487 has 24 divisors (see below), whose sum is σ = 36874656. Its totient is φ = 11344896.

The previous prime is 21095483. The next prime is 21095497. The reversal of 21095487 is 78459012.

21095487 is a `hidden beast` number, since 2 + 109 + 548 + 7 = 666.

It is not a de Polignac number, because 21095487 - 2² = 21095483 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21095483) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 8778 + ... + 10919.

It is an arithmetic number, because the mean of its divisors is an integer number (1536444).

Almost surely, 2^21095487 is an apocalyptic number.

21095487 is a deficient number, since it is larger than the sum of its proper divisors (15779169).

21095487 is a wasteful number, since it uses less digits than its factorization.

21095487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19727 (or 19724 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 36.

The square root of 21095487 is about 4592.9823644338. The cubic root of 21095487 is about 276.3099463827.

The spelling of 21095487 in words is "twenty-one million, ninety-five thousand, four hundred eighty-seven".