47270021 has 2 divisors, whose sum is σ = 47270022. Its totient is φ = 47270020.

The previous prime is 47269997. The next prime is 47270023. The reversal of 47270021 is 12007274.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39513796 + 7756225 = 6286^2 + 2785^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47270021 is a prime.

Together with 47270023, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47270023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23635010 + 23635011.

It is an arithmetic number, because the mean of its divisors is an integer number (23635011).

Almost surely, 2^47270021 is an apocalyptic number.

It is an amenable number.

47270021 is a deficient number, since it is larger than the sum of its proper divisors (1).

47270021 is an equidigital number, since it uses as much as digits as its factorization.

47270021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 784, while the sum is 23.

The square root of 47270021 is about 6875.3197016575. The cubic root of 47270021 is about 361.5723942765.

Adding to 47270021 its reverse (12007274), we get a palindrome (59277295).

The spelling of 47270021 in words is "forty-seven million, two hundred seventy thousand, twenty-one".