444444444444421 has 2 divisors, whose sum is σ = 444444444444422. Its totient is φ = 444444444444420.

The previous prime is 444444444444391. The next prime is 444444444444461. The reversal of 444444444444421 is 124444444444444.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 439341973356196 + 5102471088225 = 20960486^2 + 2258865^2 .

It is a cyclic number.

It is not a de Polignac number, because 444444444444421 - 2²⁹ = 444443907573509 is a prime.

It is a nialpdrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444444444444461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222222222222210 + 222222222222211.

It is an arithmetic number, because the mean of its divisors is an integer number (222222222222211).

Almost surely, 2^{444444444444421} is an apocalyptic number.

It is an amenable number.

444444444444421 is a deficient number, since it is larger than the sum of its proper divisors (1).

444444444444421 is an equidigital number, since it uses as much as digits as its factorization.

444444444444421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 134217728, while the sum is 55.

Adding to 444444444444421 its reverse (124444444444444), we get a palindrome (568888888888865).

The spelling of 444444444444421 in words is "four hundred forty-four trillion, four hundred forty-four billion, four hundred forty-four million, four hundred forty-four thousand, four hundred twenty-one".