126133221 has 4 divisors (see below), whose sum is σ = 168177632. Its totient is φ = 84088812.

The previous prime is 126133201. The next prime is 126133223. The reversal of 126133221 is 122331621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 126133221 - 2⁶ = 126133157 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 (126133223) 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, 21022201 + ... + 21022206.

It is an arithmetic number, because the mean of its divisors is an integer number (42044408).

Almost surely, 2^126133221 is an apocalyptic number.

It is an amenable number.

126133221 is a deficient number, since it is larger than the sum of its proper divisors (42044411).

126133221 is an equidigital number, since it uses as much as digits as its factorization.

126133221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42044410.

The product of its digits is 432, while the sum is 21.

The square root of 126133221 is about 11230.9047275809. The cubic root of 126133221 is about 501.5064181838.

Adding to 126133221 its reverse (122331621), we get a palindrome (248464842).

The spelling of 126133221 in words is "one hundred twenty-six million, one hundred thirty-three thousand, two hundred twenty-one".