126511913321 has 4 divisors (see below), whose sum is σ = 126513481812. Its totient is φ = 126510344832.

The previous prime is 126511913279. The next prime is 126511913377. The reversal of 126511913321 is 123319115621.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6665089600 + 119846823721 = 81640^2 + 346189^2 .

It is a cyclic number.

It is not a de Polignac number, because 126511913321 - 2⁶ = 126511913257 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126511913921) 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, 656300 + ... + 826893.

It is an arithmetic number, because the mean of its divisors is an integer number (31628370453).

Almost surely, 2^126511913321 is an apocalyptic number.

It is an amenable number.

126511913321 is a deficient number, since it is larger than the sum of its proper divisors (1568491).

126511913321 is an equidigital number, since it uses as much as digits as its factorization.

126511913321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568490.

The product of its digits is 9720, while the sum is 35.

The spelling of 126511913321 in words is "one hundred twenty-six billion, five hundred eleven million, nine hundred thirteen thousand, three hundred twenty-one".