47121221 has 16 divisors (see below), whose sum is σ = 54722304. Its totient is φ = 39744384.

The previous prime is 47121079. The next prime is 47121241. The reversal of 47121221 is 12212174.

It is a cyclic number.

It is not a de Polignac number, because 47121221 - 2¹⁰ = 47120197 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 47121193 and 47121202.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47121241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 202121 + ... + 202353.

It is an arithmetic number, because the mean of its divisors is an integer number (3420144).

Almost surely, 2^47121221 is an apocalyptic number.

It is an amenable number.

47121221 is a deficient number, since it is larger than the sum of its proper divisors (7601083).

47121221 is a wasteful number, since it uses less digits than its factorization.

47121221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 580.

The product of its digits is 224, while the sum is 20.

The square root of 47121221 is about 6864.4898572290. The cubic root of 47121221 is about 361.1926008826.

Adding to 47121221 its reverse (12212174), we get a palindrome (59333395).

The spelling of 47121221 in words is "forty-seven million, one hundred twenty-one thousand, two hundred twenty-one".