1321131121001 has 4 divisors (see below), whose sum is σ = 1398844716372. Its totient is φ = 1243417525632.

The previous prime is 1321131120977. The next prime is 1321131121019. The reversal of 1321131121001 is 1001211311231.

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 638119782976 + 683011338025 = 798824^2 + 826445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1321131121001 - 2¹⁸ = 1321130858857 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (17), and also a Moran number because the ratio is a prime number: 77713595353 = 1321131121001 / (1 + 3 + 2 + 1 + 1 + 3 + 1 + 1 + 2 + 1 + 0 + 0 + 1).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1321131121201) 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, 38856797660 + ... + 38856797693.

It is an arithmetic number, because the mean of its divisors is an integer number (349711179093).

Almost surely, 2^{1321131121001} is an apocalyptic number.

It is an amenable number.

1321131121001 is a deficient number, since it is larger than the sum of its proper divisors (77713595371).

1321131121001 is an equidigital number, since it uses as much as digits as its factorization.

1321131121001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77713595370.

The product of its (nonzero) digits is 36, while the sum is 17.

Adding to 1321131121001 its reverse (1001211311231), we get a palindrome (2322342432232).

The spelling of 1321131121001 in words is "one trillion, three hundred twenty-one billion, one hundred thirty-one million, one hundred twenty-one thousand, one".