121242143403 has 6 divisors (see below), whose sum is σ = 175127540484. Its totient is φ = 80828095596.

The previous prime is 121242143389. The next prime is 121242143411. The reversal of 121242143403 is 304341242121.

121242143403 is a `hidden beast` number, since 1 + 2 + 1 + 242 + 14 + 3 + 403 = 666.

It is not a de Polignac number, because 121242143403 - 2¹⁸ = 121241881259 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121242243403) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6735674625 + ... + 6735674642.

It is an arithmetic number, because the mean of its divisors is an integer number (29187923414).

Almost surely, 2^121242143403 is an apocalyptic number.

121242143403 is a deficient number, since it is larger than the sum of its proper divisors (53885397081).

121242143403 is a wasteful number, since it uses less digits than its factorization.

121242143403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13471349273 (or 13471349270 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 27.

Adding to 121242143403 its reverse (304341242121), we get a palindrome (425583385524).

The spelling of 121242143403 in words is "one hundred twenty-one billion, two hundred forty-two million, one hundred forty-three thousand, four hundred three".