47821792021 has 2 divisors, whose sum is σ = 47821792022. Its totient is φ = 47821792020.

The previous prime is 47821791907. The next prime is 47821792063. The reversal of 47821792021 is 12029712874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 47430306225 + 391485796 = 217785^2 + 19786^2 .

It is a cyclic number.

It is not a de Polignac number, because 47821792021 - 2⁷ = 47821791893 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47821792621) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23910896010 + 23910896011.

It is an arithmetic number, because the mean of its divisors is an integer number (23910896011).

Almost surely, 2^47821792021 is an apocalyptic number.

It is an amenable number.

47821792021 is a deficient number, since it is larger than the sum of its proper divisors (1).

47821792021 is an equidigital number, since it uses as much as digits as its factorization.

47821792021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 43.

The spelling of 47821792021 in words is "forty-seven billion, eight hundred twenty-one million, seven hundred ninety-two thousand, twenty-one".