13505012121 has 8 divisors (see below), whose sum is σ = 18007928800. Its totient is φ = 9002718432.

The previous prime is 13505012111. The next prime is 13505012141. The reversal of 13505012121 is 12121050531.

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

It is not a de Polignac number, because 13505012121 - 2⁵ = 13505012089 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (13505012111) 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, 102571 + ... + 193728.

It is an arithmetic number, because the mean of its divisors is an integer number (2250991100).

Almost surely, 2^13505012121 is an apocalyptic number.

It is an amenable number.

13505012121 is a deficient number, since it is larger than the sum of its proper divisors (4502916679).

13505012121 is a wasteful number, since it uses less digits than its factorization.

13505012121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 311495.

The product of its (nonzero) digits is 300, while the sum is 21.

Adding to 13505012121 its reverse (12121050531), we get a palindrome (25626062652).

The spelling of 13505012121 in words is "thirteen billion, five hundred five million, twelve thousand, one hundred twenty-one".