121342520105 has 8 divisors (see below), whose sum is σ = 145672816392. Its totient is φ = 97032821248.

The previous prime is 121342520087. The next prime is 121342520107. The reversal of 121342520105 is 501025243121.

It can be written as a sum of positive squares in 4 ways, for example, as 991809049 + 120350711056 = 31493^2 + 346916^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-121342520105 is a prime.

It is a super-2 number, since 2×121342520105² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121342520107) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 5136392 + ... + 5159961.

It is an arithmetic number, because the mean of its divisors is an integer number (18209102049).

Almost surely, 2^121342520105 is an apocalyptic number.

It is an amenable number.

121342520105 is a deficient number, since it is larger than the sum of its proper divisors (24330296287).

121342520105 is a wasteful number, since it uses less digits than its factorization.

121342520105 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10298715.

The product of its (nonzero) digits is 2400, while the sum is 26.

Adding to 121342520105 its reverse (501025243121), we get a palindrome (622367763226).

The spelling of 121342520105 in words is "one hundred twenty-one billion, three hundred forty-two million, five hundred twenty thousand, one hundred five".