244666421 has 4 divisors (see below), whose sum is σ = 244820844. Its totient is φ = 244512000.

The previous prime is 244666403. The next prime is 244666481. The reversal of 244666421 is 124666442.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 124666442 = 2 ⋅62333221.

It can be written as a sum of positive squares in 2 ways, for example, as 204204100 + 40462321 = 14290^2 + 6361^2 .

It is a cyclic number.

It is not a de Polignac number, because 244666421 - 2¹⁰ = 244665397 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 (244666481) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 74810 + ... + 78011.

It is an arithmetic number, because the mean of its divisors is an integer number (61205211).

Almost surely, 2^244666421 is an apocalyptic number.

It is an amenable number.

244666421 is a deficient number, since it is larger than the sum of its proper divisors (154423).

244666421 is a wasteful number, since it uses less digits than its factorization.

244666421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154422.

The product of its digits is 55296, while the sum is 35.

The square root of 244666421 is about 15641.8164226537. The cubic root of 244666421 is about 625.4483575373.

The spelling of 244666421 in words is "two hundred forty-four million, six hundred sixty-six thousand, four hundred twenty-one".