1321100202123 has 12 divisors (see below), whose sum is σ = 2055044759040. Its totient is φ = 812984739696.

The previous prime is 1321100202113. The next prime is 1321100202173. The reversal of 1321100202123 is 3212020011231.

It is not a de Polignac number, because 1321100202123 - 2⁸ = 1321100201867 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1321100202096 and 1321100202105.

It is not an unprimeable number, because it can be changed into a prime (1321100202113) 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, 5645727243 + ... + 5645727476.

It is an arithmetic number, because the mean of its divisors is an integer number (171253729920).

Almost surely, 2^{1321100202123} is an apocalyptic number.

1321100202123 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

1321100202123 is a deficient number, since it is larger than the sum of its proper divisors (733944556917).

1321100202123 is a wasteful number, since it uses less digits than its factorization.

1321100202123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11291454738 (or 11291454735 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 18.

Adding to 1321100202123 its reverse (3212020011231), we get a palindrome (4533120213354).

The spelling of 1321100202123 in words is "one trillion, three hundred twenty-one billion, one hundred million, two hundred two thousand, one hundred twenty-three".