121620512617 has 8 divisors (see below), whose sum is σ = 129327345576. Its totient is φ = 113975089152.

The previous prime is 121620512603. The next prime is 121620512627. The reversal of 121620512617 is 716215026121.

It can be written as a sum of positive squares in 4 ways, for example, as 529736256 + 121090776361 = 23016^2 + 347981^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 121620512617 - 2¹¹ = 121620510569 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121620512627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15348288 + ... + 15356209.

It is an arithmetic number, because the mean of its divisors is an integer number (16165918197).

Almost surely, 2^121620512617 is an apocalyptic number.

121620512617 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

121620512617 is a deficient number, since it is larger than the sum of its proper divisors (7706832959).

121620512617 is a wasteful number, since it uses less digits than its factorization.

121620512617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30704747.

The product of its (nonzero) digits is 10080, while the sum is 34.

Adding to 121620512617 its reverse (716215026121), we get a palindrome (837835538738).

The spelling of 121620512617 in words is "one hundred twenty-one billion, six hundred twenty million, five hundred twelve thousand, six hundred seventeen".