121564531313 has 8 divisors (see below), whose sum is σ = 128186778720. Its totient is φ = 114964695360.

The previous prime is 121564531229. The next prime is 121564531331. The reversal of 121564531313 is 313135465121.

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

It is not a de Polignac number, because 121564531313 - 2¹⁰ = 121564530289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (121564531343) 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, 5591720 + ... + 5613417.

It is an arithmetic number, because the mean of its divisors is an integer number (16023347340).

Almost surely, 2^121564531313 is an apocalyptic number.

It is an amenable number.

121564531313 is a deficient number, since it is larger than the sum of its proper divisors (6622247407).

121564531313 is a wasteful number, since it uses less digits than its factorization.

121564531313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11205727.

The product of its digits is 32400, while the sum is 35.

Adding to 121564531313 its reverse (313135465121), we get a palindrome (434699996434).

The spelling of 121564531313 in words is "one hundred twenty-one billion, five hundred sixty-four million, five hundred thirty-one thousand, three hundred thirteen".