13215245515021 has 16 divisors (see below), whose sum is σ = 15001934238720. Its totient is φ = 11535578172720.

The previous prime is 13215245515019. The next prime is 13215245515037. The reversal of 13215245515021 is 12051554251231.

It is a cyclic number.

It is not a de Polignac number, because 13215245515021 - 2¹ = 13215245515019 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13215245515091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 236745045 + ... + 236800858.

It is an arithmetic number, because the mean of its divisors is an integer number (937620889920).

Almost surely, 2^{13215245515021} is an apocalyptic number.

13215245515021 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

13215245515021 is a deficient number, since it is larger than the sum of its proper divisors (1786688723699).

13215245515021 is a wasteful number, since it uses less digits than its factorization.

13215245515021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 473546016.

The product of its (nonzero) digits is 60000, while the sum is 37.

Adding to 13215245515021 its reverse (12051554251231), we get a palindrome (25266799766252).

The spelling of 13215245515021 in words is "thirteen trillion, two hundred fifteen billion, two hundred forty-five million, five hundred fifteen thousand, twenty-one".