121212321203 has 4 divisors (see below), whose sum is σ = 121213167120. Its totient is φ = 121211475288.

The previous prime is 121212321199. The next prime is 121212321211. The reversal of 121212321203 is 302123212121.

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: 302123212121 = 1171 ⋅258004451.

It is a cyclic number.

It is not a de Polignac number, because 121212321203 - 2² = 121212321199 is a prime.

It is a super-2 number, since 2×121212321203² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121212321233) 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, 148775 + ... + 514352.

It is an arithmetic number, because the mean of its divisors is an integer number (30303291780).

Almost surely, 2^121212321203 is an apocalyptic number.

121212321203 is a deficient number, since it is larger than the sum of its proper divisors (845917).

121212321203 is an equidigital number, since it uses as much as digits as its factorization.

121212321203 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 845916.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 121212321203 its reverse (302123212121), we get a palindrome (423335533324).

The spelling of 121212321203 in words is "one hundred twenty-one billion, two hundred twelve million, three hundred twenty-one thousand, two hundred three".