121554404455121 has 24 divisors (see below), whose sum is σ = 133696911828480. Its totient is φ = 110431626117120.

The previous prime is 121554404455093. The next prime is 121554404455163.

It is a happy number.

121554404455121 is nontrivially palindromic in base 10.

It is a de Polignac number, because none of the positive numbers 2^k-121554404455121 is a prime.

It is not an unprimeable number, because it can be changed into a prime (121554404451121) 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, 3923245796 + ... + 3923276778.

It is an arithmetic number, because the mean of its divisors is an integer number (5570704659520).

Almost surely, 2^{121554404455121} is an apocalyptic number.

121554404455121 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

121554404455121 is a deficient number, since it is larger than the sum of its proper divisors (12142507373359).

121554404455121 is a wasteful number, since it uses less digits than its factorization.

121554404455121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51197 (or 51186 counting only the distinct ones).

The product of its (nonzero) digits is 640000, while the sum is 44.

The spelling of 121554404455121 in words is "one hundred twenty-one trillion, five hundred fifty-four billion, four hundred four million, four hundred fifty-five thousand, one hundred twenty-one".