244221021 has 16 divisors (see below), whose sum is σ = 394701120. Its totient is φ = 148012560.

The previous prime is 244220981. The next prime is 244221077. The reversal of 244221021 is 120122442.

244221021 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 244221021 - 2⁶ = 244220957 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 244220985 and 244221003.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (244221091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 410850 + ... + 411443.

It is an arithmetic number, because the mean of its divisors is an integer number (24668820).

Almost surely, 2^244221021 is an apocalyptic number.

It is an amenable number.

244221021 is a deficient number, since it is larger than the sum of its proper divisors (150480099).

244221021 is a wasteful number, since it uses less digits than its factorization.

244221021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822313 (or 822307 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 244221021 is about 15627.5724602383. The cubic root of 244221021 is about 625.0685970575.

Adding to 244221021 its reverse (120122442), we get a palindrome (364343463).

The spelling of 244221021 in words is "two hundred forty-four million, two hundred twenty-one thousand, twenty-one".