7426380821 has 2 divisors, whose sum is σ = 7426380822. Its totient is φ = 7426380820.

The previous prime is 7426380817. The next prime is 7426380883. The reversal of 7426380821 is 1280836247.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4557600100 + 2868780721 = 67510^2 + 53561^2 .

It is a cyclic number.

It is not a de Polignac number, because 7426380821 - 2² = 7426380817 is a prime.

It is a super-2 number, since 2×7426380821² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7426380121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3713190410 + 3713190411.

It is an arithmetic number, because the mean of its divisors is an integer number (3713190411).

Almost surely, 2^7426380821 is an apocalyptic number.

It is an amenable number.

7426380821 is a deficient number, since it is larger than the sum of its proper divisors (1).

7426380821 is an equidigital number, since it uses as much as digits as its factorization.

7426380821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 129024, while the sum is 41.

The square root of 7426380821 is about 86176.4516616924. The cubic root of 7426380821 is about 1951.0080977294.

The spelling of 7426380821 in words is "seven billion, four hundred twenty-six million, three hundred eighty thousand, eight hundred twenty-one".