1001211022121 has 4 divisors (see below), whose sum is σ = 1002768116112. Its totient is φ = 999653928132.

The previous prime is 1001211022111. The next prime is 1001211022127. The reversal of 1001211022121 is 1212201121001.

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 a cyclic number.

It is not a de Polignac number, because 1001211022121 - 2²⁶ = 1001143913257 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 1001211022096 and 1001211022105.

It is not an unprimeable number, because it can be changed into a prime (1001211022127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 778546031 + ... + 778547316.

It is an arithmetic number, because the mean of its divisors is an integer number (250692029028).

Almost surely, 2^{1001211022121} is an apocalyptic number.

It is an amenable number.

1001211022121 is a deficient number, since it is larger than the sum of its proper divisors (1557093991).

1001211022121 is an equidigital number, since it uses as much as digits as its factorization.

1001211022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1557093990.

The product of its (nonzero) digits is 16, while the sum is 14.

Adding to 1001211022121 its reverse (1212201121001), we get a palindrome (2213412143122).

The spelling of 1001211022121 in words is "one trillion, one billion, two hundred eleven million, twenty-two thousand, one hundred twenty-one".