1021331122121 has 4 divisors (see below), whose sum is σ = 1021354564500. Its totient is φ = 1021307679744.

The previous prime is 1021331122109. The next prime is 1021331122159. The reversal of 1021331122121 is 1212211331201.

1021331122121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 289835796496 + 731495325625 = 538364^2 + 855275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1021331122121 is a prime.

It is a super-2 number, since 2×1021331122121² (a number of 25 digits) contains 22 as substring.

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 = 1021331122093 and 1021331122102.

It is not an unprimeable number, because it can be changed into a prime (1021331122181) 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, 11655716 + ... + 11743013.

It is an arithmetic number, because the mean of its divisors is an integer number (255338641125).

Almost surely, 2^{1021331122121} is an apocalyptic number.

It is an amenable number.

1021331122121 is a deficient number, since it is larger than the sum of its proper divisors (23442379).

1021331122121 is an equidigital number, since it uses as much as digits as its factorization.

1021331122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23442378.

The product of its (nonzero) digits is 144, while the sum is 20.

Adding to 1021331122121 its reverse (1212211331201), we get a palindrome (2233542453322).

The spelling of 1021331122121 in words is "one trillion, twenty-one billion, three hundred thirty-one million, one hundred twenty-two thousand, one hundred twenty-one".