1331121013021 has 4 divisors (see below), whose sum is σ = 1331326788700. Its totient is φ = 1330915237344.

The previous prime is 1331121012989. The next prime is 1331121013031. The reversal of 1331121013021 is 1203101211331.

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 140591252025 + 1190529760996 = 374955^2 + 1091114^2 .

It is a cyclic number.

It is not a de Polignac number, because 1331121013021 - 2⁵ = 1331121012989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331121013021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331121013031) 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, 102878136 + ... + 102891073.

It is an arithmetic number, because the mean of its divisors is an integer number (332831697175).

Almost surely, 2^{1331121013021} is an apocalyptic number.

It is an amenable number.

1331121013021 is a deficient number, since it is larger than the sum of its proper divisors (205775679).

1331121013021 is an equidigital number, since it uses as much as digits as its factorization.

1331121013021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 205775678.

The product of its (nonzero) digits is 108, while the sum is 19.

Adding to 1331121013021 its reverse (1203101211331), we get a palindrome (2534222224352).

The spelling of 1331121013021 in words is "one trillion, three hundred thirty-one billion, one hundred twenty-one million, thirteen thousand, twenty-one".