47871221 has 4 divisors (see below), whose sum is σ = 47902272. Its totient is φ = 47840172.

The previous prime is 47871217. The next prime is 47871227. The reversal of 47871221 is 12217874.

It is a happy number.

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 not a de Polignac number, because 47871221 - 2² = 47871217 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47871227) 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, 13085 + ... + 16338.

It is an arithmetic number, because the mean of its divisors is an integer number (11975568).

Almost surely, 2^47871221 is an apocalyptic number.

It is an amenable number.

47871221 is a deficient number, since it is larger than the sum of its proper divisors (31051).

47871221 is a wasteful number, since it uses less digits than its factorization.

47871221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 31050.

The product of its digits is 6272, while the sum is 32.

The square root of 47871221 is about 6918.9031645196. The cubic root of 47871221 is about 363.0988177922.

The spelling of 47871221 in words is "forty-seven million, eight hundred seventy-one thousand, two hundred twenty-one".