2102120987 has 2 divisors, whose sum is σ = 2102120988. Its totient is φ = 2102120986.

The previous prime is 2102120983. The next prime is 2102120989. The reversal of 2102120987 is 7890212012.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2102120987 - 2² = 2102120983 is a prime.

Together with 2102120989, it forms a pair of twin primes.

It is a Chen prime.

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, 1051060493 + 1051060494.

It is an arithmetic number, because the mean of its divisors is an integer number (1051060494).

Almost surely, 2^2102120987 is an apocalyptic number.

2102120987 is a deficient number, since it is larger than the sum of its proper divisors (1).

2102120987 is an equidigital number, since it uses as much as digits as its factorization.

2102120987 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 32.

The square root of 2102120987 is about 45848.8929746401. The cubic root of 2102120987 is about 1281.0101456005.

Adding to 2102120987 its reverse (7890212012), we get a palindrome (9992332999).

The spelling of 2102120987 in words is "two billion, one hundred two million, one hundred twenty thousand, nine hundred eighty-seven".