13405215121 has 8 divisors (see below), whose sum is σ = 13692591360. Its totient is φ = 13117928928.

The previous prime is 13405215119. The next prime is 13405215133. The reversal of 13405215121 is 12151250431.

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 13405215121 - 2¹ = 13405215119 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13405215191) 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, 340365 + ... + 377701.

It is an arithmetic number, because the mean of its divisors is an integer number (1711573920).

Almost surely, 2^13405215121 is an apocalyptic number.

It is an amenable number.

13405215121 is a deficient number, since it is larger than the sum of its proper divisors (287376239).

13405215121 is an equidigital number, since it uses as much as digits as its factorization.

13405215121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45023.

The product of its (nonzero) digits is 1200, while the sum is 25.

Adding to 13405215121 its reverse (12151250431), we get a palindrome (25556465552).

The spelling of 13405215121 in words is "thirteen billion, four hundred five million, two hundred fifteen thousand, one hundred twenty-one".