1231020221603 has 2 divisors, whose sum is σ = 1231020221604. Its totient is φ = 1231020221602.

The previous prime is 1231020221569. The next prime is 1231020221647. The reversal of 1231020221603 is 3061220201321.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1231020221603 - 2³⁰ = 1229946479779 is a prime.

It is a Sophie Germain prime.

It is not a weakly prime, because it can be changed into another prime (1231026221603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 615510110801 + 615510110802.

It is an arithmetic number, because the mean of its divisors is an integer number (615510110802).

Almost surely, 2^{1231020221603} is an apocalyptic number.

1231020221603 is a deficient number, since it is larger than the sum of its proper divisors (1).

1231020221603 is an equidigital number, since it uses as much as digits as its factorization.

1231020221603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 864, while the sum is 23.

Adding to 1231020221603 its reverse (3061220201321), we get a palindrome (4292240422924).

The spelling of 1231020221603 in words is "one trillion, two hundred thirty-one billion, twenty million, two hundred twenty-one thousand, six hundred three".