121321020121203 has 64 divisors (see below), whose sum is σ = 189092320128000. Its totient is φ = 69161290248960.

The previous prime is 121321020121181. The next prime is 121321020121237. The reversal of 121321020121203 is 302121020123121.

It is not a de Polignac number, because 121321020121203 - 2⁸ = 121321020120947 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 121321020121203.

It is not an unprimeable number, because it can be changed into a prime (121321020121283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1186358088 + ... + 1186460346.

It is an arithmetic number, because the mean of its divisors is an integer number (2954567502000).

Almost surely, 2^{121321020121203} is an apocalyptic number.

121321020121203 is a deficient number, since it is larger than the sum of its proper divisors (67771300006797).

121321020121203 is a wasteful number, since it uses less digits than its factorization.

121321020121203 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105017 (or 105003 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 21.

Adding to 121321020121203 its reverse (302121020123121), we get a palindrome (423442040244324).

The spelling of 121321020121203 in words is "one hundred twenty-one trillion, three hundred twenty-one billion, twenty million, one hundred twenty-one thousand, two hundred three".