244213021 has 4 divisors (see below), whose sum is σ = 262998652. Its totient is φ = 225427392.

The previous prime is 244212989. The next prime is 244213037. The reversal of 244213021 is 120312442.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 120312442 = 2 ⋅60156221.

It can be written as a sum of positive squares in 2 ways, for example, as 29268100 + 214944921 = 5410^2 + 14661^2 .

It is a cyclic number.

It is not a de Polignac number, because 244213021 - 2⁵ = 244212989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 244213021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (244213421) 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, 9392796 + ... + 9392821.

It is an arithmetic number, because the mean of its divisors is an integer number (65749663).

Almost surely, 2^244213021 is an apocalyptic number.

It is an amenable number.

244213021 is a deficient number, since it is larger than the sum of its proper divisors (18785631).

244213021 is a wasteful number, since it uses less digits than its factorization.

244213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18785630.

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 244213021 is about 15627.3165002824. The cubic root of 244213021 is about 625.0617718146.

Adding to 244213021 its reverse (120312442), we get a palindrome (364525463).

The spelling of 244213021 in words is "two hundred forty-four million, two hundred thirteen thousand, twenty-one".