1331320221023 has 16 divisors (see below), whose sum is σ = 1545998412000. Its totient is φ = 1135835550720.

The previous prime is 1331320221013. The next prime is 1331320221037. The reversal of 1331320221023 is 3201220231331.

It is not a de Polignac number, because 1331320221023 - 2¹² = 1331320216927 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1331320221023.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1331320221013) 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, 65721098 + ... + 65741351.

It is an arithmetic number, because the mean of its divisors is an integer number (96624900750).

Almost surely, 2^{1331320221023} is an apocalyptic number.

1331320221023 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1331320221023 is a deficient number, since it is larger than the sum of its proper divisors (214678190977).

1331320221023 is a wasteful number, since it uses less digits than its factorization.

1331320221023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131462522.

The product of its (nonzero) digits is 1296, while the sum is 23.

Adding to 1331320221023 its reverse (3201220231331), we get a palindrome (4532540452354).

The spelling of 1331320221023 in words is "one trillion, three hundred thirty-one billion, three hundred twenty million, two hundred twenty-one thousand, twenty-three".