1001001020121 has 12 divisors (see below), whose sum is σ = 1449665538048. Its totient is φ = 665591624664.

The previous prime is 1001001020077. The next prime is 1001001020137. The reversal of 1001001020121 is 1210201001001.

It is a happy number.

1001001020121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1001001020121 - 2¹³ = 1001001011929 is a prime.

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

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1001001020191) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 145195425 + ... + 145202318.

It is an arithmetic number, because the mean of its divisors is an integer number (120805461504).

Almost surely, 2^{1001001020121} is an apocalyptic number.

It is an amenable number.

1001001020121 is a deficient number, since it is larger than the sum of its proper divisors (448664517927).

1001001020121 is a wasteful number, since it uses less digits than its factorization.

1001001020121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290398132 (or 290398129 counting only the distinct ones).

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

Adding to 1001001020121 its reverse (1210201001001), we get a palindrome (2211202021122).

The spelling of 1001001020121 in words is "one trillion, one billion, one million, twenty thousand, one hundred twenty-one".