4444000000021 has 2 divisors, whose sum is σ = 4444000000022. Its totient is φ = 4444000000020.

The previous prime is 4443999999977. The next prime is 4444000000057. The reversal of 4444000000021 is 1200000004444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4413318624100 + 30681375921 = 2100790^2 + 175161^2 .

It is a cyclic number.

It is not a de Polignac number, because 4444000000021 - 2¹⁹ = 4443999475733 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (4444000000091) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2222000000010 + 2222000000011.

It is an arithmetic number, because the mean of its divisors is an integer number (2222000000011).

Almost surely, 2^{4444000000021} is an apocalyptic number.

It is an amenable number.

4444000000021 is a deficient number, since it is larger than the sum of its proper divisors (1).

4444000000021 is an equidigital number, since it uses as much as digits as its factorization.

4444000000021 is an evil number, because the sum of its binary digits is even.

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

Adding to 4444000000021 its reverse (1200000004444), we get a palindrome (5644000004465).

The spelling of 4444000000021 in words is "four trillion, four hundred forty-four billion, twenty-one", and thus it is an aban number.