1131203123221 has 8 divisors (see below), whose sum is σ = 1176974353080. Its totient is φ = 1085882841792.

The previous prime is 1131203123203. The next prime is 1131203123233. The reversal of 1131203123221 is 1223213021311.

It can be written as a sum of positive squares in 4 ways, for example, as 74398563121 + 1056804560100 = 272761^2 + 1028010^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1131203123221 - 2¹⁵ = 1131203090453 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1131203123192 and 1131203123201.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1131203193221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 112731990 + ... + 112742023.

It is an arithmetic number, because the mean of its divisors is an integer number (147121794135).

Almost surely, 2^{1131203123221} is an apocalyptic number.

It is an amenable number.

1131203123221 is a deficient number, since it is larger than the sum of its proper divisors (45771229859).

1131203123221 is a wasteful number, since it uses less digits than its factorization.

1131203123221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225474215.

The product of its (nonzero) digits is 432, while the sum is 22.

Adding to 1131203123221 its reverse (1223213021311), we get a palindrome (2354416144532).

The spelling of 1131203123221 in words is "one trillion, one hundred thirty-one billion, two hundred three million, one hundred twenty-three thousand, two hundred twenty-one".