1001012121023 has 4 divisors (see below), whose sum is σ = 1001031019560. Its totient is φ = 1000993222488.

The previous prime is 1001012120981. The next prime is 1001012121029. The reversal of 1001012121023 is 3201212101001.

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

It is a cyclic number.

It is not a de Polignac number, because 1001012121023 - 2²⁶ = 1000945012159 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001012120989 and 1001012121007.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1001012121029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9369593 + ... + 9475826.

It is an arithmetic number, because the mean of its divisors is an integer number (250257754890).

Almost surely, 2^{1001012121023} is an apocalyptic number.

1001012121023 is a deficient number, since it is larger than the sum of its proper divisors (18898537).

1001012121023 is an equidigital number, since it uses as much as digits as its factorization.

1001012121023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18898536.

The product of its (nonzero) digits is 24, while the sum is 14.

Adding to 1001012121023 its reverse (3201212101001), we get a palindrome (4202224222024).

The spelling of 1001012121023 in words is "one trillion, one billion, twelve million, one hundred twenty-one thousand, twenty-three".