1200210101 has 2 divisors, whose sum is σ = 1200210102. Its totient is φ = 1200210100.

The previous prime is 1200210073. The next prime is 1200210103. The reversal of 1200210101 is 1010120021.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1193702500 + 6507601 = 34550^2 + 2551^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1200210101 is a prime.

It is a Sophie Germain prime.

Together with 1200210103, it forms a pair of twin primes.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1200210103) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 600105050 + 600105051.

It is an arithmetic number, because the mean of its divisors is an integer number (600105051).

Almost surely, 2^1200210101 is an apocalyptic number.

It is an amenable number.

1200210101 is a deficient number, since it is larger than the sum of its proper divisors (1).

1200210101 is an equidigital number, since it uses as much as digits as its factorization.

1200210101 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 1200210101 is about 34644.0485653741. The cubic root of 1200210101 is about 1062.7205837935.

Adding to 1200210101 its reverse (1010120021), we get a palindrome (2210330122).

The spelling of 1200210101 in words is "one billion, two hundred million, two hundred ten thousand, one hundred one".