121561013064 has 32 divisors (see below), whose sum is σ = 319897404000. Its totient is φ = 38387688192.

The previous prime is 121561013033. The next prime is 121561013069. The reversal of 121561013064 is 460310165121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121561013069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 133290129 + ... + 133291040.

It is an arithmetic number, because the mean of its divisors is an integer number (9996793875).

Almost surely, 2^121561013064 is an apocalyptic number.

It is an amenable number.

121561013064 is an abundant number, since it is smaller than the sum of its proper divisors (198336390936).

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

121561013064 is a wasteful number, since it uses less digits than its factorization.

121561013064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266581197 (or 266581193 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 30.

Adding to 121561013064 its reverse (460310165121), we get a palindrome (581871178185).

The spelling of 121561013064 in words is "one hundred twenty-one billion, five hundred sixty-one million, thirteen thousand, sixty-four".