1323102100021 has 12 divisors (see below), whose sum is σ = 1456195222020. Its totient is φ = 1201303284480.

The previous prime is 1323102099983. The next prime is 1323102100037. The reversal of 1323102100021 is 1200012013231.

It can be written as a sum of positive squares in 6 ways, for example, as 876592150225 + 446509949796 = 936265^2 + 668214^2 .

It is not a de Polignac number, because 1323102100021 - 2⁹ = 1323102099509 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1323102099968 and 1323102100004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1323102100921) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64161876 + ... + 64182493.

It is an arithmetic number, because the mean of its divisors is an integer number (121349601835).

Almost surely, 2^{1323102100021} is an apocalyptic number.

It is an amenable number.

1323102100021 is a deficient number, since it is larger than the sum of its proper divisors (133093121999).

1323102100021 is a wasteful number, since it uses less digits than its factorization.

1323102100021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128344456 (or 128344443 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 16.

Adding to 1323102100021 its reverse (1200012013231), we get a palindrome (2523114113252).

The spelling of 1323102100021 in words is "one trillion, three hundred twenty-three billion, one hundred two million, one hundred thousand, twenty-one".