47942221 has 2 divisors, whose sum is σ = 47942222. Its totient is φ = 47942220.

The previous prime is 47942203. The next prime is 47942231. The reversal of 47942221 is 12224974.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45414121 + 2528100 = 6739^2 + 1590^2 .

It is a cyclic number.

It is not a de Polignac number, because 47942221 - 2¹⁵ = 47909453 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47942231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23971110 + 23971111.

It is an arithmetic number, because the mean of its divisors is an integer number (23971111).

Almost surely, 2^47942221 is an apocalyptic number.

It is an amenable number.

47942221 is a deficient number, since it is larger than the sum of its proper divisors (1).

47942221 is an equidigital number, since it uses as much as digits as its factorization.

47942221 is an evil number, because the sum of its binary digits is even.

The product of its digits is 8064, while the sum is 31.

The square root of 47942221 is about 6924.0321345297. The cubic root of 47942221 is about 363.2782386136.

The spelling of 47942221 in words is "forty-seven million, nine hundred forty-two thousand, two hundred twenty-one".