2002100981 has 2 divisors, whose sum is σ = 2002100982. Its totient is φ = 2002100980.

The previous prime is 2002100977. The next prime is 2002100983. The reversal of 2002100981 is 1890012002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2001130756 + 970225 = 44734^2 + 985^2 .

It is a cyclic number.

It is not a de Polignac number, because 2002100981 - 2² = 2002100977 is a prime.

It is a super-2 number, since 2×2002100981² = 8016816676242324722, which contains 22 as substring.

Together with 2002100983, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2002100983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1001050490 + 1001050491.

It is an arithmetic number, because the mean of its divisors is an integer number (1001050491).

Almost surely, 2^2002100981 is an apocalyptic number.

It is an amenable number.

2002100981 is a deficient number, since it is larger than the sum of its proper divisors (1).

2002100981 is an equidigital number, since it uses as much as digits as its factorization.

2002100981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 23.

The square root of 2002100981 is about 44744.8430659892. The cubic root of 2002100981 is about 1260.3620738650.

Adding to 2002100981 its reverse (1890012002), we get a palindrome (3892112983).

The spelling of 2002100981 in words is "two billion, two million, one hundred thousand, nine hundred eighty-one".