47271421 has 4 divisors (see below), whose sum is σ = 48901500. Its totient is φ = 45641344.

The previous prime is 47271397. The next prime is 47271443. The reversal of 47271421 is 12417274.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 30140100 + 17131321 = 5490^2 + 4139^2 .

It is a cyclic number.

It is not a de Polignac number, because 47271421 - 2¹⁹ = 46747133 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 47271421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47271461) 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, 814996 + ... + 815053.

It is an arithmetic number, because the mean of its divisors is an integer number (12225375).

Almost surely, 2^47271421 is an apocalyptic number.

It is an amenable number.

47271421 is a deficient number, since it is larger than the sum of its proper divisors (1630079).

47271421 is a wasteful number, since it uses less digits than its factorization.

47271421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1630078.

The product of its digits is 3136, while the sum is 28.

The square root of 47271421 is about 6875.4215143510. The cubic root of 47271421 is about 361.5759638141.

Adding to 47271421 its reverse (12417274), we get a palindrome (59688695).

The spelling of 47271421 in words is "forty-seven million, two hundred seventy-one thousand, four hundred twenty-one".