1321013221023 has 16 divisors (see below), whose sum is σ = 1790787382272. Its totient is φ = 865966332000.

The previous prime is 1321013221009. The next prime is 1321013221061. The reversal of 1321013221023 is 3201223101231.

It is not a de Polignac number, because 1321013221023 - 2⁸ = 1321013220767 is a prime.

It is a super-2 number, since 2×1321013221023² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1321013221823) 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, 547143 + ... + 1715048.

It is an arithmetic number, because the mean of its divisors is an integer number (111924211392).

Almost surely, 2^{1321013221023} is an apocalyptic number.

1321013221023 is a deficient number, since it is larger than the sum of its proper divisors (469774161249).

1321013221023 is a wasteful number, since it uses less digits than its factorization.

1321013221023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2265446.

The product of its (nonzero) digits is 432, while the sum is 21.

Adding to 1321013221023 its reverse (3201223101231), we get a palindrome (4522236322254).

The spelling of 1321013221023 in words is "one trillion, three hundred twenty-one billion, thirteen million, two hundred twenty-one thousand, twenty-three".