1210001100001 has 4 divisors (see below), whose sum is σ = 1210059051712. Its totient is φ = 1209943148292.

The previous prime is 1210001099987. The next prime is 1210001100029. The reversal of 1210001100001 is 1000011000121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1210001100001 - 2¹⁷ = 1210000968929 is a prime.

It is the 1100001-st Hogben number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1210001140001) by changing a digit.

It is a nontrivial repunit in base 1100000.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28944525 + ... + 28986298.

It is an arithmetic number, because the mean of its divisors is an integer number (302514762928).

Almost surely, 2^{1210001100001} is an apocalyptic number.

It is an amenable number.

1210001100001 is a deficient number, since it is larger than the sum of its proper divisors (57951711).

1210001100001 is an equidigital number, since it uses as much as digits as its factorization.

1210001100001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57951710.

The product of its (nonzero) digits is 2, while the sum is 7.

Adding to 1210001100001 its reverse (1000011000121), we get a palindrome (2210012100122).

The spelling of 1210001100001 in words is "one trillion, two hundred ten billion, one million, one hundred thousand, one".