126711889921 has 4 divisors (see below), whose sum is σ = 126801821700. Its totient is φ = 126621958144.

The previous prime is 126711889907. The next prime is 126711889937. The reversal of 126711889921 is 129988117621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 129988117621 = 619 ⋅209996959.

It can be written as a sum of positive squares in 2 ways, for example, as 32364010000 + 94347879921 = 179900^2 + 307161^2 .

It is a cyclic number.

It is not a de Polignac number, because 126711889921 - 2¹¹ = 126711887873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126711889321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44963776 + ... + 44966593.

It is an arithmetic number, because the mean of its divisors is an integer number (31700455425).

Almost surely, 2^126711889921 is an apocalyptic number.

It is an amenable number.

126711889921 is a deficient number, since it is larger than the sum of its proper divisors (89931779).

126711889921 is an equidigital number, since it uses as much as digits as its factorization.

126711889921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89931778.

The product of its digits is 870912, while the sum is 55.

The spelling of 126711889921 in words is "one hundred twenty-six billion, seven hundred eleven million, eight hundred eighty-nine thousand, nine hundred twenty-one".