1131021400321 has 4 divisors (see below), whose sum is σ = 1131023532100. Its totient is φ = 1131019268544.

The previous prime is 1131021400279. The next prime is 1131021400343. The reversal of 1131021400321 is 1230041201311.

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 916689438721 + 214331961600 = 957439^2 + 462960^2 .

It is a cyclic number.

It is not a de Polignac number, because 1131021400321 - 2³⁷ = 993582446849 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1131021400361) 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, 425845 + ... + 1563133.

It is an arithmetic number, because the mean of its divisors is an integer number (282755883025).

Almost surely, 2^{1131021400321} is an apocalyptic number.

It is an amenable number.

1131021400321 is a deficient number, since it is larger than the sum of its proper divisors (2131779).

1131021400321 is an equidigital number, since it uses as much as digits as its factorization.

1131021400321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2131778.

The product of its (nonzero) digits is 144, while the sum is 19.

Adding to 1131021400321 its reverse (1230041201311), we get a palindrome (2361062601632).

The spelling of 1131021400321 in words is "one trillion, one hundred thirty-one billion, twenty-one million, four hundred thousand, three hundred twenty-one".