7161508021 has 2 divisors, whose sum is σ = 7161508022. Its totient is φ = 7161508020.

The previous prime is 7161508019. The next prime is 7161508033. The reversal of 7161508021 is 1208051617.

7161508021 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 6066228996 + 1095279025 = 77886^2 + 33095^2 .

It is a cyclic number.

It is not a de Polignac number, because 7161508021 - 2¹ = 7161508019 is a prime.

Together with 7161508019, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7161508421) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3580754010 + 3580754011.

It is an arithmetic number, because the mean of its divisors is an integer number (3580754011).

Almost surely, 2^7161508021 is an apocalyptic number.

It is an amenable number.

7161508021 is a deficient number, since it is larger than the sum of its proper divisors (1).

7161508021 is an equidigital number, since it uses as much as digits as its factorization.

7161508021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3360, while the sum is 31.

The square root of 7161508021 is about 84625.6936219728. The cubic root of 7161508021 is about 1927.5315450086.

Adding to 7161508021 its reverse (1208051617), we get a palindrome (8369559638).

The spelling of 7161508021 in words is "seven billion, one hundred sixty-one million, five hundred eight thousand, twenty-one".