2130215981 has 2 divisors, whose sum is σ = 2130215982. Its totient is φ = 2130215980.

The previous prime is 2130215939. The next prime is 2130216017. The reversal of 2130215981 is 1895120312.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1454735881 + 675480100 = 38141^2 + 25990^2 .

It is a cyclic number.

It is not a de Polignac number, because 2130215981 - 2⁶ = 2130215917 is a prime.

It is a super-2 number, since 2×2130215981² = 9075640251415584722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2130215881) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1065107990 + 1065107991.

It is an arithmetic number, because the mean of its divisors is an integer number (1065107991).

Almost surely, 2^2130215981 is an apocalyptic number.

It is an amenable number.

2130215981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2130215981 is an equidigital number, since it uses as much as digits as its factorization.

2130215981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 32.

The square root of 2130215981 is about 46154.2628692085. The cubic root of 2130215981 is about 1286.6918382668.

The spelling of 2130215981 in words is "two billion, one hundred thirty million, two hundred fifteen thousand, nine hundred eighty-one".