2116000021 has 2 divisors, whose sum is σ = 2116000022. Its totient is φ = 2116000020.

The previous prime is 2115999989. The next prime is 2116000057. The reversal of 2116000021 is 1200006112.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1862871921 + 253128100 = 43161^2 + 15910^2 .

It is a cyclic number.

It is not a de Polignac number, because 2116000021 - 2⁵ = 2115999989 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2115999965 and 2116000010.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2116004021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1058000010 + 1058000011.

It is an arithmetic number, because the mean of its divisors is an integer number (1058000011).

Almost surely, 2^2116000021 is an apocalyptic number.

It is an amenable number.

2116000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

2116000021 is an equidigital number, since it uses as much as digits as its factorization.

2116000021 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2116000021 is about 46000.0002282609. Note that the first 3 decimals coincide. The cubic root of 2116000021 is about 1283.8232088462.

Adding to 2116000021 its reverse (1200006112), we get a palindrome (3316006133).

The spelling of 2116000021 in words is "two billion, one hundred sixteen million, twenty-one", and thus it is an aban number.