121400055 has 24 divisors (see below), whose sum is σ = 240488352. Its totient is φ = 55497024.

The previous prime is 121400053. The next prime is 121400087. The reversal of 121400055 is 550004121.

It is not a de Polignac number, because 121400055 - 2¹ = 121400053 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121400053) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 192384 + ... + 193013.

It is an arithmetic number, because the mean of its divisors is an integer number (10020348).

Almost surely, 2^121400055 is an apocalyptic number.

121400055 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

121400055 is a deficient number, since it is larger than the sum of its proper divisors (119088297).

121400055 is a wasteful number, since it uses less digits than its factorization.

121400055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385415 (or 385412 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 121400055 is about 11018.1693125492. The cubic root of 121400055 is about 495.1532430344.

Adding to 121400055 its reverse (550004121), we get a palindrome (671404176).

The spelling of 121400055 in words is "one hundred twenty-one million, four hundred thousand, fifty-five".