121000551305 has 16 divisors (see below), whose sum is σ = 154737437184. Its totient is φ = 90621685440.

The previous prime is 121000551293. The next prime is 121000551359. The reversal of 121000551305 is 503155000121.

It is a happy number.

It is not a de Polignac number, because 121000551305 - 2⁶ = 121000551241 is a prime.

It is a super-2 number, since 2×121000551305² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (23).

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11187986 + ... + 11198795.

It is an arithmetic number, because the mean of its divisors is an integer number (9671089824).

Almost surely, 2^121000551305 is an apocalyptic number.

It is an amenable number.

121000551305 is a deficient number, since it is larger than the sum of its proper divisors (33736885879).

121000551305 is a wasteful number, since it uses less digits than its factorization.

121000551305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22386856.

The product of its (nonzero) digits is 750, while the sum is 23.

Adding to 121000551305 its reverse (503155000121), we get a palindrome (624155551426).

The spelling of 121000551305 in words is "one hundred twenty-one billion, five hundred fifty-one thousand, three hundred five".