121030808818 has 4 divisors (see below), whose sum is σ = 181546213230. Its totient is φ = 60515404408.

The previous prime is 121030808813. The next prime is 121030808867. The reversal of 121030808818 is 818808030121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 116098977289 + 4931831529 = 340733^2 + 70227^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (121030808813) 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 as a sum of consecutive naturals, namely, 30257702203 + ... + 30257702206.

Almost surely, 2^121030808818 is an apocalyptic number.

121030808818 is a deficient number, since it is larger than the sum of its proper divisors (60515404412).

121030808818 is an equidigital number, since it uses as much as digits as its factorization.

121030808818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60515404411.

The product of its (nonzero) digits is 24576, while the sum is 40.

Adding to 121030808818 its reverse (818808030121), we get a palindrome (939838838939).

The spelling of 121030808818 in words is "one hundred twenty-one billion, thirty million, eight hundred eight thousand, eight hundred eighteen".