5918420821 has 2 divisors, whose sum is σ = 5918420822. Its totient is φ = 5918420820.

The previous prime is 5918420791. The next prime is 5918420839. The reversal of 5918420821 is 1280248195.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5911918321 + 6502500 = 76889^2 + 2550^2 .

It is a cyclic number.

It is not a de Polignac number, because 5918420821 - 2⁷ = 5918420693 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5918420861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2959210410 + 2959210411.

It is an arithmetic number, because the mean of its divisors is an integer number (2959210411).

Almost surely, 2^5918420821 is an apocalyptic number.

It is an amenable number.

5918420821 is a deficient number, since it is larger than the sum of its proper divisors (1).

5918420821 is an equidigital number, since it uses as much as digits as its factorization.

5918420821 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46080, while the sum is 40.

The square root of 5918420821 is about 76931.2733613581. The cubic root of 5918420821 is about 1808.8474720704.

The spelling of 5918420821 in words is "five billion, nine hundred eighteen million, four hundred twenty thousand, eight hundred twenty-one".