244440421 has 2 divisors, whose sum is σ = 244440422. Its totient is φ = 244440420.

The previous prime is 244440403. The next prime is 244440437. The reversal of 244440421 is 124044442.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 214300321 + 30140100 = 14639^2 + 5490^2 .

It is a cyclic number.

It is not a de Polignac number, because 244440421 - 2¹³ = 244432229 is a prime.

It is a super-2 number, since 2×244440421² = 119502238837314482, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (244440451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 122220210 + 122220211.

It is an arithmetic number, because the mean of its divisors is an integer number (122220211).

Almost surely, 2^244440421 is an apocalyptic number.

It is an amenable number.

244440421 is a deficient number, since it is larger than the sum of its proper divisors (1).

244440421 is an equidigital number, since it uses as much as digits as its factorization.

244440421 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4096, while the sum is 25.

The square root of 244440421 is about 15634.5905286963. The cubic root of 244440421 is about 625.2557212763.

Adding to 244440421 its reverse (124044442), we get a palindrome (368484863).

The spelling of 244440421 in words is "two hundred forty-four million, four hundred forty thousand, four hundred twenty-one".