121355400054 has 32 divisors (see below), whose sum is σ = 278127463680. Its totient is φ = 34580009952.

The previous prime is 121355400017. The next prime is 121355400079. The reversal of 121355400054 is 450004553121.

It is a junction number, because it is equal to n+sod(n) for n = 121355399994 and 121355400030.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3857544 + ... + 3888875.

It is an arithmetic number, because the mean of its divisors is an integer number (8691483240).

Almost surely, 2^121355400054 is an apocalyptic number.

121355400054 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

121355400054 is an abundant number, since it is smaller than the sum of its proper divisors (156772063626).

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

121355400054 is a wasteful number, since it uses less digits than its factorization.

121355400054 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7746804.

The product of its (nonzero) digits is 12000, while the sum is 30.

Adding to 121355400054 its reverse (450004553121), we get a palindrome (571359953175).

The spelling of 121355400054 in words is "one hundred twenty-one billion, three hundred fifty-five million, four hundred thousand, fifty-four".