1321100144021 has 24 divisors (see below), whose sum is σ = 1557221267520. Its totient is φ = 1117405226112.

The previous prime is 1321100143973. The next prime is 1321100144047. The reversal of 1321100144021 is 1204410011231.

It is not a de Polignac number, because 1321100144021 - 2¹⁰ = 1321100142997 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321100143984 and 1321100144002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321100144921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 731360 + ... + 1782438.

It is an arithmetic number, because the mean of its divisors is an integer number (64884219480).

Almost surely, 2^{1321100144021} is an apocalyptic number.

It is an amenable number.

1321100144021 is a deficient number, since it is larger than the sum of its proper divisors (236121123499).

1321100144021 is a wasteful number, since it uses less digits than its factorization.

1321100144021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1051433 (or 1051426 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 20.

Adding to 1321100144021 its reverse (1204410011231), we get a palindrome (2525510155252).

The spelling of 1321100144021 in words is "one trillion, three hundred twenty-one billion, one hundred million, one hundred forty-four thousand, twenty-one".