121203243 has 16 divisors (see below), whose sum is σ = 205212160. Its totient is φ = 69258888.

The previous prime is 121203193. The next prime is 121203347. The reversal of 121203243 is 342302121.

It is not a de Polignac number, because 121203243 - 2¹⁴ = 121186859 is a prime.

It is a super-2 number, since 2×121203243² = 29380452227434098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121207243) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 320455 + ... + 320832.

It is an arithmetic number, because the mean of its divisors is an integer number (12825760).

Almost surely, 2^121203243 is an apocalyptic number.

121203243 is a deficient number, since it is larger than the sum of its proper divisors (84008917).

121203243 is an equidigital number, since it uses as much as digits as its factorization.

121203243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 641303 (or 641297 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 121203243 is about 11009.2344420491. The cubic root of 121203243 is about 494.8855198987.

Adding to 121203243 its reverse (342302121), we get a palindrome (463505364).

It can be divided in two parts, 121203 and 243, that multiplied together give a square (29452329 = 5427²).

The spelling of 121203243 in words is "one hundred twenty-one million, two hundred three thousand, two hundred forty-three".