12126657319 has 4 divisors (see below), whose sum is σ = 13859036944. Its totient is φ = 10394277696.

The previous prime is 12126657317. The next prime is 12126657329. The reversal of 12126657319 is 91375662121.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91375662121 = 97423 ⋅937927.

It is a cyclic number.

It is not a de Polignac number, because 12126657319 - 2¹ = 12126657317 is a prime.

It is a super-2 number, since 2×12126657319² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12126657317) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 866189802 + ... + 866189815.

It is an arithmetic number, because the mean of its divisors is an integer number (3464759236).

Almost surely, 2^12126657319 is an apocalyptic number.

12126657319 is a deficient number, since it is larger than the sum of its proper divisors (1732379625).

12126657319 is an equidigital number, since it uses as much as digits as its factorization.

12126657319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1732379624.

The product of its digits is 136080, while the sum is 43.

The spelling of 12126657319 in words is "twelve billion, one hundred twenty-six million, six hundred fifty-seven thousand, three hundred nineteen".