1210000000001 has 4 divisors (see below), whose sum is σ = 1303076923092. Its totient is φ = 1116923076912.

The previous prime is 1209999999907. The next prime is 1210000000021. The reversal of 1210000000001 is 1000000000121.

It is a happy number.

It is a Cunningham number, because it is equal to 1100000²+1.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 178993301776 + 1031006698225 = 423076^2 + 1015385^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1210000000001 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1210000000021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46538461526 + ... + 46538461551.

It is an arithmetic number, because the mean of its divisors is an integer number (325769230773).

Almost surely, 2^{1210000000001} is an apocalyptic number.

It is an amenable number.

1210000000001 is a deficient number, since it is larger than the sum of its proper divisors (93076923091).

1210000000001 is an equidigital number, since it uses as much as digits as its factorization.

1210000000001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93076923090.

The product of its (nonzero) digits is 2, while the sum is 5.

Adding to 1210000000001 its reverse (1000000000121), we get a palindrome (2210000000122).

The spelling of 1210000000001 in words is "one trillion, two hundred ten billion, one", and thus it is an aban number.