2081630021 has 2 divisors, whose sum is σ = 2081630022. Its totient is φ = 2081630020.

The previous prime is 2081630017. The next prime is 2081630039. The reversal of 2081630021 is 1200361802.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2005696225 + 75933796 = 44785^2 + 8714^2 .

It is a cyclic number.

It is not a de Polignac number, because 2081630021 - 2² = 2081630017 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2081630041) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1040815010 + 1040815011.

It is an arithmetic number, because the mean of its divisors is an integer number (1040815011).

Almost surely, 2^2081630021 is an apocalyptic number.

It is an amenable number.

2081630021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2081630021 is an equidigital number, since it uses as much as digits as its factorization.

2081630021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 23.

The square root of 2081630021 is about 45624.8837916328. The cubic root of 2081630021 is about 1276.8342219379.

Adding to 2081630021 its reverse (1200361802), we get a palindrome (3281991823).

The spelling of 2081630021 in words is "two billion, eighty-one million, six hundred thirty thousand, twenty-one".