126421321 has 4 divisors (see below), whose sum is σ = 136146052. Its totient is φ = 116696592.

The previous prime is 126421313. The next prime is 126421331. The reversal of 126421321 is 123124621.

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 63441225 + 62980096 = 7965^2 + 7936^2 .

It is a cyclic number.

It is not a de Polignac number, because 126421321 - 2³ = 126421313 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 126421292 and 126421301.

It is not an unprimeable number, because it can be changed into a prime (126421331) 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, 4862346 + ... + 4862371.

It is an arithmetic number, because the mean of its divisors is an integer number (34036513).

Almost surely, 2^126421321 is an apocalyptic number.

It is an amenable number.

126421321 is a deficient number, since it is larger than the sum of its proper divisors (9724731).

126421321 is an equidigital number, since it uses as much as digits as its factorization.

126421321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9724730.

The product of its digits is 576, while the sum is 22.

The square root of 126421321 is about 11243.7236269841. The cubic root of 126421321 is about 501.8879569314.

Adding to 126421321 its reverse (123124621), we get a palindrome (249545942).

The spelling of 126421321 in words is "one hundred twenty-six million, four hundred twenty-one thousand, three hundred twenty-one".