2141213981 has 2 divisors, whose sum is σ = 2141213982. Its totient is φ = 2141213980.

The previous prime is 2141213959. The next prime is 2141214041. The reversal of 2141213981 is 1893121412.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1106626756 + 1034587225 = 33266^2 + 32165^2 .

It is a cyclic number.

It is not a de Polignac number, because 2141213981 - 2³⁰ = 1067472157 is a prime.

It is a super-2 number, since 2×2141213981² = 9169594624859736722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2141213951) 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, 1070606990 + 1070606991.

It is an arithmetic number, because the mean of its divisors is an integer number (1070606991).

Almost surely, 2^2141213981 is an apocalyptic number.

It is an amenable number.

2141213981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2141213981 is an equidigital number, since it uses as much as digits as its factorization.

2141213981 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 2141213981 is about 46273.2534084216. The cubic root of 2141213981 is about 1288.9023736173.

The spelling of 2141213981 in words is "two billion, one hundred forty-one million, two hundred thirteen thousand, nine hundred eighty-one".