121400305155 has 48 divisors (see below), whose sum is σ = 221554045440. Its totient is φ = 61324776000.

The previous prime is 121400305153. The next prime is 121400305171. The reversal of 121400305155 is 551503004121.

121400305155 is a `hidden beast` number, since 1 + 2 + 140 + 0 + 3 + 0 + 515 + 5 = 666.

It is not a de Polignac number, because 121400305155 - 2¹ = 121400305153 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121400305153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4304550 + ... + 4332660.

It is an arithmetic number, because the mean of its divisors is an integer number (4615709280).

Almost surely, 2^121400305155 is an apocalyptic number.

121400305155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121400305155 is a deficient number, since it is larger than the sum of its proper divisors (100153740285).

121400305155 is a wasteful number, since it uses less digits than its factorization.

121400305155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33192 (or 33189 counting only the distinct ones).

The product of its (nonzero) digits is 3000, while the sum is 27.

Adding to 121400305155 its reverse (551503004121), we get a palindrome (672903309276).

The spelling of 121400305155 in words is "one hundred twenty-one billion, four hundred million, three hundred five thousand, one hundred fifty-five".