12135263760221 has 16 divisors (see below), whose sum is σ = 13884541371648. Its totient is φ = 10389905664000.

The previous prime is 12135263760181. The next prime is 12135263760311. The reversal of 12135263760221 is 12206736253121.

It is a cyclic number.

It is not a de Polignac number, because 12135263760221 - 2⁴² = 7737217249117 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 (12135263769221) 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, 64181021 + ... + 64369821.

It is an arithmetic number, because the mean of its divisors is an integer number (867783835728).

Almost surely, 2^{12135263760221} is an apocalyptic number.

It is an amenable number.

12135263760221 is a deficient number, since it is larger than the sum of its proper divisors (1749277611427).

12135263760221 is an equidigital number, since it uses as much as digits as its factorization.

12135263760221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 199132.

The product of its (nonzero) digits is 181440, while the sum is 41.

The spelling of 12135263760221 in words is "twelve trillion, one hundred thirty-five billion, two hundred sixty-three million, seven hundred sixty thousand, two hundred twenty-one".