21082047 has 8 divisors (see below), whose sum is σ = 32125056. Its totient is φ = 12046872.

The previous prime is 21082021. The next prime is 21082063. The reversal of 21082047 is 74028012.

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

It is not a de Polignac number, because 21082047 - 2⁷ = 21081919 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21082147) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 501933 + ... + 501974.

It is an arithmetic number, because the mean of its divisors is an integer number (4015632).

Almost surely, 2^21082047 is an apocalyptic number.

21082047 is a deficient number, since it is larger than the sum of its proper divisors (11043009).

21082047 is a wasteful number, since it uses less digits than its factorization.

21082047 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1003917.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 21082047 is about 4591.5190296894. The cubic root of 21082047 is about 276.2512546096.

The spelling of 21082047 in words is "twenty-one million, eighty-two thousand, forty-seven".