121340420505 has 24 divisors (see below), whose sum is σ = 212365378368. Its totient is φ = 64086588576.

The previous prime is 121340420477. The next prime is 121340420507. The reversal of 121340420505 is 505024043121.

121340420505 is a `hidden beast` number, since 1 + 2 + 134 + 0 + 4 + 20 + 505 = 666.

It is not a de Polignac number, because 121340420505 - 2¹² = 121340416409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121340420507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13084947 + ... + 13094216.

It is an arithmetic number, because the mean of its divisors is an integer number (8848557432).

Almost surely, 2^121340420505 is an apocalyptic number.

121340420505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

121340420505 is a deficient number, since it is larger than the sum of its proper divisors (91024957863).

121340420505 is a wasteful number, since it uses less digits than its factorization.

121340420505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26179277 (or 26179274 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 27.

Adding to 121340420505 its reverse (505024043121), we get a palindrome (626364463626).

The spelling of 121340420505 in words is "one hundred twenty-one billion, three hundred forty million, four hundred twenty thousand, five hundred five".