1321131122221 has 16 divisors (see below), whose sum is σ = 1414374062400. Its totient is φ = 1230263330688.

The previous prime is 1321131122137. The next prime is 1321131122243. The reversal of 1321131122221 is 1222211311231.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1321131122221 - 2¹³ = 1321131114029 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1321131122192 and 1321131122201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321131122251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12566751 + ... + 12671443.

It is an arithmetic number, because the mean of its divisors is an integer number (88398378900).

Almost surely, 2^{1321131122221} is an apocalyptic number.

It is an amenable number.

1321131122221 is a deficient number, since it is larger than the sum of its proper divisors (93242940179).

1321131122221 is a wasteful number, since it uses less digits than its factorization.

1321131122221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116028.

The product of its digits is 288, while the sum is 22.

Adding to 1321131122221 its reverse (1222211311231), we get a palindrome (2543342433452).

The spelling of 1321131122221 in words is "one trillion, three hundred twenty-one billion, one hundred thirty-one million, one hundred twenty-two thousand, two hundred twenty-one".