121212203203 has 16 divisors (see below), whose sum is σ = 150578507520. Its totient is φ = 95007852576.

The previous prime is 121212203197. The next prime is 121212203267. The reversal of 121212203203 is 302302212121.

It is not a de Polignac number, because 121212203203 - 2⁵ = 121212203171 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121212203603) 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 15 ways as a sum of consecutive naturals, for example, 6214573 + ... + 6234046.

It is an arithmetic number, because the mean of its divisors is an integer number (9411156720).

Almost surely, 2^121212203203 is an apocalyptic number.

121212203203 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

121212203203 is a deficient number, since it is larger than the sum of its proper divisors (29366304317).

121212203203 is a wasteful number, since it uses less digits than its factorization.

121212203203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12448746.

The product of its (nonzero) digits is 288, while the sum is 19.

Adding to 121212203203 its reverse (302302212121), we get a palindrome (423514415324).

It can be divided in two parts, 121212 and 203203, that added together give a triangular number (324415 = T₈₀₅).

The spelling of 121212203203 in words is "one hundred twenty-one billion, two hundred twelve million, two hundred three thousand, two hundred three".