1001122121001 has 4 divisors (see below), whose sum is σ = 1334829494672. Its totient is φ = 667414747332.

The previous prime is 1001122120979. The next prime is 1001122121009. The reversal of 1001122121001 is 1001212211001.

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 not a de Polignac number, because 1001122121001 - 2³⁰ = 1000048379177 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1001122121009) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166853686831 + ... + 166853686836.

It is an arithmetic number, because the mean of its divisors is an integer number (333707373668).

Almost surely, 2^{1001122121001} is an apocalyptic number.

It is an amenable number.

1001122121001 is a deficient number, since it is larger than the sum of its proper divisors (333707373671).

1001122121001 is an equidigital number, since it uses as much as digits as its factorization.

1001122121001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333707373670.

The product of its (nonzero) digits is 8, while the sum is 12.

Adding to 1001122121001 its reverse (1001212211001), we get a palindrome (2002334332002).

The spelling of 1001122121001 in words is "one trillion, one billion, one hundred twenty-two million, one hundred twenty-one thousand, one".