121399444403 has 4 divisors (see below), whose sum is σ = 121871816040. Its totient is φ = 120927072768.

The previous prime is 121399444393. The next prime is 121399444423. The reversal of 121399444403 is 304444993121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 304444993121 = 534659 ⋅569419.

It is a cyclic number.

It is not a de Polignac number, because 121399444403 - 2¹⁰ = 121399443379 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121399444423) 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 3 ways as a sum of consecutive naturals, for example, 236185433 + ... + 236185946.

It is an arithmetic number, because the mean of its divisors is an integer number (30467954010).

Almost surely, 2^121399444403 is an apocalyptic number.

121399444403 is a deficient number, since it is larger than the sum of its proper divisors (472371637).

121399444403 is an equidigital number, since it uses as much as digits as its factorization.

121399444403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 472371636.

The product of its (nonzero) digits is 373248, while the sum is 44.

The spelling of 121399444403 in words is "one hundred twenty-one billion, three hundred ninety-nine million, four hundred forty-four thousand, four hundred three".