1121021002121 has 4 divisors (see below), whose sum is σ = 1121023304772. Its totient is φ = 1121018699472.

The previous prime is 1121021002111. The next prime is 1121021002159. The reversal of 1121021002121 is 1212001201211.

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 928931643721 + 192089358400 = 963811^2 + 438280^2 .

It is a cyclic number.

It is not a de Polignac number, because 1121021002121 - 2¹⁸ = 1121020739977 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1121021002096 and 1121021002105.

It is not an unprimeable number, because it can be changed into a prime (1121021002111) 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, 102710 + ... + 1500863.

It is an arithmetic number, because the mean of its divisors is an integer number (280255826193).

Almost surely, 2^{1121021002121} is an apocalyptic number.

It is an amenable number.

1121021002121 is a deficient number, since it is larger than the sum of its proper divisors (2302651).

1121021002121 is an equidigital number, since it uses as much as digits as its factorization.

1121021002121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2302650.

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

Adding to 1121021002121 its reverse (1212001201211), we get a palindrome (2333022203332).

The spelling of 1121021002121 in words is "one trillion, one hundred twenty-one billion, twenty-one million, two thousand, one hundred twenty-one".