121351520345 has 16 divisors (see below), whose sum is σ = 158934942720. Its totient is φ = 88214112000.

The previous prime is 121351520317. The next prime is 121351520351. The reversal of 121351520345 is 543025153121.

It is not a de Polignac number, because 121351520345 - 2¹⁴ = 121351503961 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 401081 + ... + 635270.

It is an arithmetic number, because the mean of its divisors is an integer number (9933433920).

Almost surely, 2^121351520345 is an apocalyptic number.

It is an amenable number.

121351520345 is a deficient number, since it is larger than the sum of its proper divisors (37583422375).

121351520345 is a wasteful number, since it uses less digits than its factorization.

121351520345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1038496.

The product of its (nonzero) digits is 18000, while the sum is 32.

Adding to 121351520345 its reverse (543025153121), we get a palindrome (664376673466).

The spelling of 121351520345 in words is "one hundred twenty-one billion, three hundred fifty-one million, five hundred twenty thousand, three hundred forty-five".