47813221 has 8 divisors (see below), whose sum is σ = 48374784. Its totient is φ = 47255280.

The previous prime is 47813201. The next prime is 47813239. The reversal of 47813221 is 12231874.

47813221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 47813221 - 2⁵ = 47813189 is a prime.

It is a super-2 number, since 2×47813221² = 4572208204789682, which contains 22 as substring.

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 47813221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47813201) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32320 + ... + 33766.

It is an arithmetic number, because the mean of its divisors is an integer number (6046848).

Almost surely, 2^47813221 is an apocalyptic number.

It is an amenable number.

47813221 is a deficient number, since it is larger than the sum of its proper divisors (561563).

47813221 is a wasteful number, since it uses less digits than its factorization.

47813221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1811.

The product of its digits is 2688, while the sum is 28.

The square root of 47813221 is about 6914.7104783931. The cubic root of 47813221 is about 362.9521169705.

The spelling of 47813221 in words is "forty-seven million, eight hundred thirteen thousand, two hundred twenty-one".