1121002100001 has 24 divisors (see below), whose sum is σ = 1850637436544. Its totient is φ = 640539990720.

The previous prime is 1121002099991. The next prime is 1121002100039. The reversal of 1121002100001 is 1000012001211.

It is a happy number.

It is not a de Polignac number, because 1121002100001 - 2⁵ = 1121002099969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1121002100401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 821205 + ... + 1707741.

Almost surely, 2^{1121002100001} is an apocalyptic number.

It is an amenable number.

1121002100001 is a deficient number, since it is larger than the sum of its proper divisors (729635336543).

1121002100001 is a wasteful number, since it uses less digits than its factorization.

1121002100001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 906621 (or 906618 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

Adding to 1121002100001 its reverse (1000012001211), we get a palindrome (2121014101212).

The spelling of 1121002100001 in words is "one trillion, one hundred twenty-one billion, two million, one hundred thousand, one".