121153181018 has 4 divisors (see below), whose sum is σ = 181729771530. Its totient is φ = 60576590508.

The previous prime is 121153180931. The next prime is 121153181057. The reversal of 121153181018 is 810181351121.

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., 116112607009 + 5040574009 = 340753^2 + 70997^2 .

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 30288295253 + ... + 30288295256.

Almost surely, 2^121153181018 is an apocalyptic number.

121153181018 is a deficient number, since it is larger than the sum of its proper divisors (60576590512).

121153181018 is an equidigital number, since it uses as much as digits as its factorization.

121153181018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60576590511.

The product of its (nonzero) digits is 1920, while the sum is 32.

The spelling of 121153181018 in words is "one hundred twenty-one billion, one hundred fifty-three million, one hundred eighty-one thousand, eighteen".