1000001022121 has 4 divisors (see below), whose sum is σ = 1000004501700. Its totient is φ = 999997542544.

The previous prime is 1000001022109. The next prime is 1000001022151. The reversal of 1000001022121 is 1212201000001.

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

It can be written as a sum of positive squares in 2 ways, for example, as 796770464400 + 203230557721 = 892620^2 + 450811^2 .

It is a cyclic number.

It is not a de Polignac number, because 1000001022121 - 2⁹ = 1000001021609 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1000001022098 and 1000001022107.

It is not an unprimeable number, because it can be changed into a prime (1000001022101) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1265626 + ... + 1897843.

It is an arithmetic number, because the mean of its divisors is an integer number (250001125425).

Almost surely, 2^{1000001022121} is an apocalyptic number.

It is an amenable number.

1000001022121 is a deficient number, since it is larger than the sum of its proper divisors (3479579).

1000001022121 is an equidigital number, since it uses as much as digits as its factorization.

1000001022121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3479578.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 1000001022121 its reverse (1212201000001), we get a palindrome (2212202022122).

The spelling of 1000001022121 in words is "one trillion, one million, twenty-two thousand, one hundred twenty-one".