126421205 has 4 divisors (see below), whose sum is σ = 151705452. Its totient is φ = 101136960.

The previous prime is 126421187. The next prime is 126421213. The reversal of 126421205 is 502124621.

It is a happy number.

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 28153636 + 98267569 = 5306^2 + 9913^2 .

It is not a de Polignac number, because 126421205 - 2¹⁰ = 126420181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12642116 + ... + 12642125.

It is an arithmetic number, because the mean of its divisors is an integer number (37926363).

Almost surely, 2^126421205 is an apocalyptic number.

It is an amenable number.

126421205 is a deficient number, since it is larger than the sum of its proper divisors (25284247).

126421205 is an equidigital number, since it uses as much as digits as its factorization.

126421205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25284246.

The product of its (nonzero) digits is 960, while the sum is 23.

The square root of 126421205 is about 11243.7184685495. The cubic root of 126421205 is about 501.8878034261.

Adding to 126421205 its reverse (502124621), we get a palindrome (628545826).

The spelling of 126421205 in words is "one hundred twenty-six million, four hundred twenty-one thousand, two hundred five".