12615643134221 has 8 divisors (see below), whose sum is σ = 13164249808320. Its totient is φ = 12067044831072.

The previous prime is 12615643134179. The next prime is 12615643134233. The reversal of 12615643134221 is 12243134651621.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12615643134221 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12615643134251) 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, 1089950 + ... + 5139968.

It is an arithmetic number, because the mean of its divisors is an integer number (1645531226040).

Almost surely, 2^{12615643134221} is an apocalyptic number.

It is an amenable number.

12615643134221 is a deficient number, since it is larger than the sum of its proper divisors (548606674099).

12615643134221 is a wasteful number, since it uses less digits than its factorization.

12615643134221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4185475.

The product of its digits is 207360, while the sum is 41.

Adding to 12615643134221 its reverse (12243134651621), we get a palindrome (24858777785842).

The spelling of 12615643134221 in words is "twelve trillion, six hundred fifteen billion, six hundred forty-three million, one hundred thirty-four thousand, two hundred twenty-one".