121553145005 has 4 divisors (see below), whose sum is σ = 145863774012. Its totient is φ = 97242516000.

The previous prime is 121553145001. The next prime is 121553145013. The reversal of 121553145005 is 500541355121.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 31109198884 + 90443946121 = 176378^2 + 300739^2 .

It is not a de Polignac number, because 121553145005 - 2² = 121553145001 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121553145001) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12155314496 + ... + 12155314505.

It is an arithmetic number, because the mean of its divisors is an integer number (36465943503).

Almost surely, 2^121553145005 is an apocalyptic number.

It is an amenable number.

121553145005 is a deficient number, since it is larger than the sum of its proper divisors (24310629007).

121553145005 is an equidigital number, since it uses as much as digits as its factorization.

121553145005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24310629006.

The product of its (nonzero) digits is 15000, while the sum is 32.

The spelling of 121553145005 in words is "one hundred twenty-one billion, five hundred fifty-three million, one hundred forty-five thousand, five".