21076047 has 12 divisors (see below), whose sum is σ = 30494880. Its totient is φ = 14026848.

The previous prime is 21076043. The next prime is 21076057. The reversal of 21076047 is 74067012.

It is not a de Polignac number, because 21076047 - 2² = 21076043 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21076047.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21076043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 4843 + ... + 8099.

It is an arithmetic number, because the mean of its divisors is an integer number (2541240).

Almost surely, 2^21076047 is an apocalyptic number.

21076047 is a deficient number, since it is larger than the sum of its proper divisors (9418833).

21076047 is a wasteful number, since it uses less digits than its factorization.

21076047 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3982 (or 3979 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 21076047 is about 4590.8656046545. The cubic root of 21076047 is about 276.2250448714.

The spelling of 21076047 in words is "twenty-one million, seventy-six thousand, forty-seven".