121231211303 has 4 divisors (see below), whose sum is σ = 121232058288. Its totient is φ = 121230364320.

The previous prime is 121231211219. The next prime is 121231211351. The reversal of 121231211303 is 303112132121.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 303112132121 = 462499 ⋅655379.

It is a cyclic number.

It is not a de Polignac number, because 121231211303 - 2¹⁰ = 121231210279 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121231211363) 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, 149858 + ... + 514703.

It is an arithmetic number, because the mean of its divisors is an integer number (30308014572).

Almost surely, 2^121231211303 is an apocalyptic number.

121231211303 is a deficient number, since it is larger than the sum of its proper divisors (846985).

121231211303 is an equidigital number, since it uses as much as digits as its factorization.

121231211303 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 846984.

The product of its (nonzero) digits is 216, while the sum is 20.

Adding to 121231211303 its reverse (303112132121), we get a palindrome (424343343424).

The spelling of 121231211303 in words is "one hundred twenty-one billion, two hundred thirty-one million, two hundred eleven thousand, three hundred three".