12367886521 has 3 divisors (see below), whose sum is σ = 12367997733. Its totient is φ = 12367775310.

The previous prime is 12367886501. The next prime is 12367886537. The reversal of 12367886521 is 12568876321.

It is a happy number.

The square root of 12367886521 is 111211.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 12568876321 = 112111².

It is not a de Polignac number, because 12367886521 - 2⁹ = 12367886009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12367886501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 55606 + ... + 166816.

It is an arithmetic number, because the mean of its divisors is an integer number (4122665911).

Almost surely, 2^12367886521 is an apocalyptic number.

12367886521 is the 111211-st square number.

12367886521 is the 55606-th centered octagonal number.

It is an amenable number.

12367886521 is a deficient number, since it is larger than the sum of its proper divisors (111212).

12367886521 is an frugal number, since it uses more digits than its factorization.

12367886521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222422 (or 111211 counting only the distinct ones).

The product of its digits is 967680, while the sum is 49.

Multiplying 12367886521 by its sum of digits (49), we get a square (606026439529 = 778477²).

The spelling of 12367886521 in words is "twelve billion, three hundred sixty-seven million, eight hundred eighty-six thousand, five hundred twenty-one".