7726994021 has 2 divisors, whose sum is σ = 7726994022. Its totient is φ = 7726994020.

The previous prime is 7726993993. The next prime is 7726994039. The reversal of 7726994021 is 1204996277.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7723948996 + 3045025 = 87886^2 + 1745^2 .

It is an emirp because it is prime and its reverse (1204996277) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 7726994021 - 2¹⁴ = 7726977637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7726994221) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3863497010 + 3863497011.

It is an arithmetic number, because the mean of its divisors is an integer number (3863497011).

Almost surely, 2^7726994021 is an apocalyptic number.

It is an amenable number.

7726994021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7726994021 is an equidigital number, since it uses as much as digits as its factorization.

7726994021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 7726994021 is about 87903.3220134484. The cubic root of 7726994021 is about 1976.9856882888.

The spelling of 7726994021 in words is "seven billion, seven hundred twenty-six million, nine hundred ninety-four thousand, twenty-one".