47129221 has 2 divisors, whose sum is σ = 47129222. Its totient is φ = 47129220.

The previous prime is 47129209. The next prime is 47129227. The reversal of 47129221 is 12292174.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 28206721 + 18922500 = 5311^2 + 4350^2 .

It is a cyclic number.

It is not a de Polignac number, because 47129221 - 2¹³ = 47121029 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 47129221.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47129227) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23564610 + 23564611.

It is an arithmetic number, because the mean of its divisors is an integer number (23564611).

Almost surely, 2^47129221 is an apocalyptic number.

It is an amenable number.

47129221 is a deficient number, since it is larger than the sum of its proper divisors (1).

47129221 is an equidigital number, since it uses as much as digits as its factorization.

47129221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2016, while the sum is 28.

The square root of 47129221 is about 6865.0725414958. The cubic root of 47129221 is about 361.2130402037.

It can be divided in two parts, 471 and 29221, that added together give a palindrome (29692).

The spelling of 47129221 in words is "forty-seven million, one hundred twenty-nine thousand, two hundred twenty-one".