1323103213021 has 4 divisors (see below), whose sum is σ = 1324384049692. Its totient is φ = 1321822376352.

The previous prime is 1323103213013. The next prime is 1323103213057. The reversal of 1323103213021 is 1203123013231.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 741260731225 + 581842481796 = 860965^2 + 762786^2 .

It is a cyclic number.

It is not a de Polignac number, because 1323103213021 - 2³ = 1323103213013 is a prime.

It is a super-2 number, since 2×1323103213021² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1323103212983 and 1323103213001.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323103213001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 640416786 + ... + 640418851.

It is an arithmetic number, because the mean of its divisors is an integer number (331096012423).

Almost surely, 2^{1323103213021} is an apocalyptic number.

It is an amenable number.

1323103213021 is a deficient number, since it is larger than the sum of its proper divisors (1280836671).

1323103213021 is a wasteful number, since it uses less digits than its factorization.

1323103213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1280836670.

The product of its (nonzero) digits is 648, while the sum is 22.

Adding to 1323103213021 its reverse (1203123013231), we get a palindrome (2526226226252).

The spelling of 1323103213021 in words is "one trillion, three hundred twenty-three billion, one hundred three million, two hundred thirteen thousand, twenty-one".