1321221531267 has 48 divisors (see below), whose sum is σ = 2096604881280. Its totient is φ = 795107203200.

The previous prime is 1321221531257. The next prime is 1321221531283. The reversal of 1321221531267 is 7621351221231.

1321221531267 is a `hidden beast` number, since 1 + 32 + 12 + 21 + 531 + 2 + 67 = 666.

It is not a de Polignac number, because 1321221531267 - 2³¹ = 1319074047619 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321221531257) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 12191263 + ... + 12299159.

It is an arithmetic number, because the mean of its divisors is an integer number (43679268360).

Almost surely, 2^{1321221531267} is an apocalyptic number.

1321221531267 is a deficient number, since it is larger than the sum of its proper divisors (775383350013).

1321221531267 is a wasteful number, since it uses less digits than its factorization.

1321221531267 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108784 (or 108781 counting only the distinct ones).

The product of its digits is 30240, while the sum is 36.

Adding to 1321221531267 its reverse (7621351221231), we get a palindrome (8942572752498).

The spelling of 1321221531267 in words is "one trillion, three hundred twenty-one billion, two hundred twenty-one million, five hundred thirty-one thousand, two hundred sixty-seven".