126221261 has 8 divisors (see below), whose sum is σ = 128482848. Its totient is φ = 123966000.

The previous prime is 126221257. The next prime is 126221279. The reversal of 126221261 is 162122621.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 126221261 - 2² = 126221257 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 (126221201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58166 + ... + 60296.

It is an arithmetic number, because the mean of its divisors is an integer number (16060356).

Almost surely, 2^126221261 is an apocalyptic number.

It is an amenable number.

126221261 is a deficient number, since it is larger than the sum of its proper divisors (2261587).

126221261 is an equidigital number, since it uses as much as digits as its factorization.

126221261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3163.

The product of its digits is 576, while the sum is 23.

The square root of 126221261 is about 11234.8235856198. The cubic root of 126221261 is about 501.6230735634.

Adding to 126221261 its reverse (162122621), we get a palindrome (288343882).

The spelling of 126221261 in words is "one hundred twenty-six million, two hundred twenty-one thousand, two hundred sixty-one".