1321100123203 has 16 divisors (see below), whose sum is σ = 1528837632000. Its totient is φ = 1118167554816.

The previous prime is 1321100123183. The next prime is 1321100123221. The reversal of 1321100123203 is 3023210011231.

It is a cyclic number.

It is not a de Polignac number, because 1321100123203 - 2¹³ = 1321100115011 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1321100121203) 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, 1895203 + ... + 2496796.

It is an arithmetic number, because the mean of its divisors is an integer number (95552352000).

Almost surely, 2^{1321100123203} is an apocalyptic number.

1321100123203 is a deficient number, since it is larger than the sum of its proper divisors (207737508797).

1321100123203 is an equidigital number, since it uses as much as digits as its factorization.

1321100123203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4392546.

The product of its (nonzero) digits is 216, while the sum is 19.

Adding to 1321100123203 its reverse (3023210011231), we get a palindrome (4344310134434).

The spelling of 1321100123203 in words is "one trillion, three hundred twenty-one billion, one hundred million, one hundred twenty-three thousand, two hundred three".