47708021 has 4 divisors (see below), whose sum is σ = 48312000. Its totient is φ = 47104044.

The previous prime is 47708009. The next prime is 47708029. The reversal of 47708021 is 12080774.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 12080774 = 2 ⋅6040387.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47708021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47708029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 301871 + ... + 302028.

It is an arithmetic number, because the mean of its divisors is an integer number (12078000).

Almost surely, 2^47708021 is an apocalyptic number.

It is an amenable number.

47708021 is a deficient number, since it is larger than the sum of its proper divisors (603979).

47708021 is an equidigital number, since it uses as much as digits as its factorization.

47708021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603978.

The product of its (nonzero) digits is 3136, while the sum is 29.

The square root of 47708021 is about 6907.0993188168. The cubic root of 47708021 is about 362.6857290020.

Adding to 47708021 its reverse (12080774), we get a palindrome (59788795).

The spelling of 47708021 in words is "forty-seven million, seven hundred eight thousand, twenty-one".