2102120989 has 2 divisors, whose sum is σ = 2102120990. Its totient is φ = 2102120988.

The previous prime is 2102120987. The next prime is 2102121011. The reversal of 2102120989 is 9890212012.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 2101488964 + 632025 = 45842^2 + 795^2 .

It is a cyclic number.

It is not a de Polignac number, because 2102120989 - 2¹ = 2102120987 is a prime.

Together with 2102120987, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2102120983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1051060494 + 1051060495.

It is an arithmetic number, because the mean of its divisors is an integer number (1051060495).

Almost surely, 2^2102120989 is an apocalyptic number.

It is an amenable number.

2102120989 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102120989 is an equidigital number, since it uses as much as digits as its factorization.

2102120989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 34.

The square root of 2102120989 is about 45848.8929964509. The cubic root of 2102120989 is about 1281.0101460068.

The spelling of 2102120989 in words is "two billion, one hundred two million, one hundred twenty thousand, nine hundred eighty-nine".