155404112121 has 12 divisors (see below), whose sum is σ = 234232285248. Its totient is φ = 99098274264.

The previous prime is 155404112119. The next prime is 155404112147. The reversal of 155404112121 is 121211404551.

155404112121 is a `hidden beast` number, since 1 + 5 + 540 + 4 + 112 + 1 + 2 + 1 = 666.

155404112121 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 155404112121 - 2¹ = 155404112119 is a prime.

It is not an unprimeable number, because it can be changed into a prime (155404119121) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 375372045 + ... + 375372458.

It is an arithmetic number, because the mean of its divisors is an integer number (19519357104).

Almost surely, 2^155404112121 is an apocalyptic number.

It is an amenable number.

155404112121 is a deficient number, since it is larger than the sum of its proper divisors (78828173127).

155404112121 is a wasteful number, since it uses less digits than its factorization.

155404112121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 750744532 (or 750744529 counting only the distinct ones).

The product of its (nonzero) digits is 1600, while the sum is 27.

Adding to 155404112121 its reverse (121211404551), we get a palindrome (276615516672).

The spelling of 155404112121 in words is "one hundred fifty-five billion, four hundred four million, one hundred twelve thousand, one hundred twenty-one".