47131221 has 8 divisors (see below), whose sum is σ = 63076320. Its totient is φ = 31303472.

The previous prime is 47131219. The next prime is 47131247. The reversal of 47131221 is 12213174.

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

It is a cyclic number.

It is not a de Polignac number, because 47131221 - 2¹ = 47131219 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47131211) 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, 28395 + ... + 30008.

It is an arithmetic number, because the mean of its divisors is an integer number (7884540).

Almost surely, 2^47131221 is an apocalyptic number.

It is an amenable number.

47131221 is a deficient number, since it is larger than the sum of its proper divisors (15945099).

47131221 is a wasteful number, since it uses less digits than its factorization.

47131221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58675.

The product of its digits is 336, while the sum is 21.

The square root of 47131221 is about 6865.2182048352. The cubic root of 47131221 is about 361.2181496725.

Adding to 47131221 its reverse (12213174), we get a palindrome (59344395).

The spelling of 47131221 in words is "forty-seven million, one hundred thirty-one thousand, two hundred twenty-one".