244240100021 has 4 divisors (see below), whose sum is σ = 246611363232. Its totient is φ = 241868836812.

The previous prime is 244240100011. The next prime is 244240100057. The reversal of 244240100021 is 120001042442.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 120001042442 = 2 ⋅60000521221.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-244240100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 244240099966 and 244240100002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (244240100011) 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, 1185631451 + ... + 1185631656.

It is an arithmetic number, because the mean of its divisors is an integer number (61652840808).

Almost surely, 2^244240100021 is an apocalyptic number.

It is an amenable number.

244240100021 is a deficient number, since it is larger than the sum of its proper divisors (2371263211).

244240100021 is a wasteful number, since it uses less digits than its factorization.

244240100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2371263210.

The product of its (nonzero) digits is 512, while the sum is 20.

Adding to 244240100021 its reverse (120001042442), we get a palindrome (364241142463).

The spelling of 244240100021 in words is "two hundred forty-four billion, two hundred forty million, one hundred thousand, twenty-one".