12661213922271 has 24 divisors (see below), whose sum is σ = 19033262945424. Its totient is φ = 8410770768960.

The previous prime is 12661213922263. The next prime is 12661213922281. The reversal of 12661213922271 is 17222931216621.

12661213922271 is a `hidden beast` number, since 1 + 2 + 6 + 612 + 1 + 3 + 9 + 2 + 2 + 27 + 1 = 666.

It is not a de Polignac number, because 12661213922271 - 2³ = 12661213922263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12661213922281) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 92643036 + ... + 92779601.

It is an arithmetic number, because the mean of its divisors is an integer number (793052622726).

Almost surely, 2^{12661213922271} is an apocalyptic number.

12661213922271 is a deficient number, since it is larger than the sum of its proper divisors (6372049023153).

12661213922271 is an equidigital number, since it uses as much as digits as its factorization.

12661213922271 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185422933 (or 185422921 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The spelling of 12661213922271 in words is "twelve trillion, six hundred sixty-one billion, two hundred thirteen million, nine hundred twenty-two thousand, two hundred seventy-one".