126266621 has 4 divisors (see below), whose sum is σ = 135979452. Its totient is φ = 116553792.

The previous prime is 126266611. The next prime is 126266669. The reversal of 126266621 is 126662621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 126662621 = 31 ⋅4085891.

It can be written as a sum of positive squares in 2 ways, for example, as 6604900 + 119661721 = 2570^2 + 10939^2 .

It is a cyclic number.

It is not a de Polignac number, because 126266621 - 2⁶ = 126266557 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 (126266611) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4856396 + ... + 4856421.

It is an arithmetic number, because the mean of its divisors is an integer number (33994863).

Almost surely, 2^126266621 is an apocalyptic number.

It is an amenable number.

126266621 is a deficient number, since it is larger than the sum of its proper divisors (9712831).

126266621 is an equidigital number, since it uses as much as digits as its factorization.

126266621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9712830.

The product of its digits is 10368, while the sum is 32.

The square root of 126266621 is about 11236.8421275730. The cubic root of 126266621 is about 501.6831556165.

The spelling of 126266621 in words is "one hundred twenty-six million, two hundred sixty-six thousand, six hundred twenty-one".