1321631306522 has 16 divisors (see below), whose sum is σ = 2003898427080. Its totient is φ = 653684945472.

The previous prime is 1321631306519. The next prime is 1321631306621. The reversal of 1321631306522 is 2256031361231.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 1025705098441 + 295926208081 = 1012771^2 + 543991^2 .

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 4811333 + ... + 5078600.

Almost surely, 2^{1321631306522} is an apocalyptic number.

1321631306522 is a deficient number, since it is larger than the sum of its proper divisors (682267120558).

1321631306522 is a wasteful number, since it uses less digits than its factorization.

1321631306522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9890657.

The product of its (nonzero) digits is 38880, while the sum is 35.

Adding to 1321631306522 its reverse (2256031361231), we get a palindrome (3577662667753).

The spelling of 1321631306522 in words is "one trillion, three hundred twenty-one billion, six hundred thirty-one million, three hundred six thousand, five hundred twenty-two".