47500021 has 4 divisors (see below), whose sum is σ = 47524000. Its totient is φ = 47476044.

The previous prime is 47500009. The next prime is 47500039. The reversal of 47500021 is 12000574.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47500021 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 (47500001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8721 + ... + 13078.

It is an arithmetic number, because the mean of its divisors is an integer number (11881000).

Almost surely, 2^47500021 is an apocalyptic number.

It is an amenable number.

47500021 is a deficient number, since it is larger than the sum of its proper divisors (23979).

47500021 is a wasteful number, since it uses less digits than its factorization.

47500021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23978.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 47500021 is about 6892.0258995451. The cubic root of 47500021 is about 362.1578755427.

Adding to 47500021 its reverse (12000574), we get a palindrome (59500595).

The spelling of 47500021 in words is "forty-seven million, five hundred thousand, twenty-one".