244002421 has 4 divisors (see below), whose sum is σ = 262771852. Its totient is φ = 225232992.

The previous prime is 244002403. The next prime is 244002431. The reversal of 244002421 is 124200442.

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 114725521 + 129276900 = 10711^2 + 11370^2 .

It is a cyclic number.

It is not a de Polignac number, because 244002421 - 2⁷ = 244002293 is a prime.

It is a super-2 number, since 2×244002421² = 119074362907722482, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (244002401) 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, 9384696 + ... + 9384721.

It is an arithmetic number, because the mean of its divisors is an integer number (65692963).

Almost surely, 2^244002421 is an apocalyptic number.

It is an amenable number.

244002421 is a deficient number, since it is larger than the sum of its proper divisors (18769431).

244002421 is a wasteful number, since it uses less digits than its factorization.

244002421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18769430.

The product of its (nonzero) digits is 512, while the sum is 19.

The square root of 244002421 is about 15620.5768459427. The cubic root of 244002421 is about 624.8820436595.

Adding to 244002421 its reverse (124200442), we get a palindrome (368202863).

The spelling of 244002421 in words is "two hundred forty-four million, two thousand, four hundred twenty-one".