47747627021 has 2 divisors, whose sum is σ = 47747627022. Its totient is φ = 47747627020.

The previous prime is 47747627017. The next prime is 47747627027. The reversal of 47747627021 is 12072674774.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 32909950921 + 14837676100 = 181411^2 + 121810^2 .

It is a cyclic number.

It is not a de Polignac number, because 47747627021 - 2² = 47747627017 is a prime.

It is a super-2 number, since 2×47747627021² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47747627027) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23873813510 + 23873813511.

It is an arithmetic number, because the mean of its divisors is an integer number (23873813511).

Almost surely, 2^47747627021 is an apocalyptic number.

It is an amenable number.

47747627021 is a deficient number, since it is larger than the sum of its proper divisors (1).

47747627021 is an equidigital number, since it uses as much as digits as its factorization.

47747627021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 921984, while the sum is 47.

The spelling of 47747627021 in words is "forty-seven billion, seven hundred forty-seven million, six hundred twenty-seven thousand, twenty-one".