121421041242403 has 16 divisors (see below), whose sum is σ = 143243764660224. Its totient is φ = 100717556762880.

The previous prime is 121421041242401. The next prime is 121421041242407. The reversal of 121421041242403 is 304242140124121.

It is a cyclic number.

It is not a de Polignac number, because 121421041242403 - 2¹ = 121421041242401 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (31).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121421041242401) 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, 72892851 + ... + 74539987.

It is an arithmetic number, because the mean of its divisors is an integer number (8952735291264).

Almost surely, 2^{121421041242403} is an apocalyptic number.

121421041242403 is a deficient number, since it is larger than the sum of its proper divisors (21822723417821).

121421041242403 is a wasteful number, since it uses less digits than its factorization.

121421041242403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1986882.

The product of its (nonzero) digits is 12288, while the sum is 31.

Adding to 121421041242403 its reverse (304242140124121), we get a palindrome (425663181366524).

The spelling of 121421041242403 in words is "one hundred twenty-one trillion, four hundred twenty-one billion, forty-one million, two hundred forty-two thousand, four hundred three".