1200321100203 has 4 divisors (see below), whose sum is σ = 1600428133608. Its totient is φ = 800214066800.

The previous prime is 1200321100073. The next prime is 1200321100207. The reversal of 1200321100203 is 3020011230021.

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

It is a cyclic number.

It is not a de Polignac number, because 1200321100203 - 2²² = 1200316905899 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1200321100207) 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, 200053516698 + ... + 200053516703.

It is an arithmetic number, because the mean of its divisors is an integer number (400107033402).

Almost surely, 2^{1200321100203} is an apocalyptic number.

1200321100203 is a deficient number, since it is larger than the sum of its proper divisors (400107033405).

1200321100203 is an equidigital number, since it uses as much as digits as its factorization.

1200321100203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 400107033404.

The product of its (nonzero) digits is 72, while the sum is 15.

Adding to 1200321100203 its reverse (3020011230021), we get a palindrome (4220332330224).

The spelling of 1200321100203 in words is "one trillion, two hundred billion, three hundred twenty-one million, one hundred thousand, two hundred three".