121245055155 has 48 divisors (see below), whose sum is σ = 244118107584. Its totient is φ = 54517674240.

The previous prime is 121245055133. The next prime is 121245055187. The reversal of 121245055155 is 551550542121.

121245055155 is a `hidden beast` number, since 1 + 2 + 1 + 2 + 4 + 50 + 551 + 55 = 666.

It is not a de Polignac number, because 121245055155 - 2¹⁵ = 121245022387 is a prime.

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 in 47 ways as a sum of consecutive naturals, for example, 3135744 + ... + 3174173.

It is an arithmetic number, because the mean of its divisors is an integer number (5085793908).

Almost surely, 2^121245055155 is an apocalyptic number.

121245055155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121245055155 is an abundant number, since it is smaller than the sum of its proper divisors (122873052429).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

121245055155 is a wasteful number, since it uses less digits than its factorization.

121245055155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6309996 (or 6309993 counting only the distinct ones).

The product of its (nonzero) digits is 50000, while the sum is 36.

Adding to 121245055155 its reverse (551550542121), we get a palindrome (672795597276).

The spelling of 121245055155 in words is "one hundred twenty-one billion, two hundred forty-five million, fifty-five thousand, one hundred fifty-five".