1001013121 has 8 divisors (see below), whose sum is σ = 1012003200. Its totient is φ = 990044400.

The previous prime is 1001013113. The next prime is 1001013127. The reversal of 1001013121 is 1213101001.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1001013121 - 2³ = 1001013113 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1001013098 and 1001013107.

It is not an unprimeable number, because it can be changed into a prime (1001013127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100170 + ... + 109708.

It is an arithmetic number, because the mean of its divisors is an integer number (126500400).

Almost surely, 2^1001013121 is an apocalyptic number.

It is an amenable number.

1001013121 is a deficient number, since it is larger than the sum of its proper divisors (10990079).

1001013121 is a wasteful number, since it uses less digits than its factorization.

1001013121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10679.

The product of its (nonzero) digits is 6, while the sum is 10.

The square root of 1001013121 is about 31638.7913960063. The cubic root of 1001013121 is about 1000.3375930181.

Adding to 1001013121 its reverse (1213101001), we get a palindrome (2214114122).

The spelling of 1001013121 in words is "one billion, one million, thirteen thousand, one hundred twenty-one".