2947040021 has 2 divisors, whose sum is σ = 2947040022. Its totient is φ = 2947040020.

The previous prime is 2947039987. The next prime is 2947040023. The reversal of 2947040021 is 1200407492.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2946969796 + 70225 = 54286^2 + 265^2 .

It is a cyclic number.

It is not a de Polignac number, because 2947040021 - 2¹⁴ = 2947023637 is a prime.

Together with 2947040023, 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 (2947040023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1473520010 + 1473520011.

It is an arithmetic number, because the mean of its divisors is an integer number (1473520011).

Almost surely, 2^2947040021 is an apocalyptic number.

It is an amenable number.

2947040021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2947040021 is an equidigital number, since it uses as much as digits as its factorization.

2947040021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4032, while the sum is 29.

The square root of 2947040021 is about 54286.6468019531. The cubic root of 2947040021 is about 1433.7123002928.

The spelling of 2947040021 in words is "two billion, nine hundred forty-seven million, forty thousand, twenty-one".