21444020330431 has 2 divisors, whose sum is σ = 21444020330432. Its totient is φ = 21444020330430.

The previous prime is 21444020330429. The next prime is 21444020330459. The reversal of 21444020330431 is 13403302044412.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 21444020330431 - 2¹ = 21444020330429 is a prime.

It is a super-2 number, since 2×21444020330431² (a number of 27 digits) contains 22 as substring.

Together with 21444020330429, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 21444020330393 and 21444020330402.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (21444020330401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10722010165215 + 10722010165216.

It is an arithmetic number, because the mean of its divisors is an integer number (10722010165216).

Almost surely, 2^{21444020330431} is an apocalyptic number.

21444020330431 is a deficient number, since it is larger than the sum of its proper divisors (1).

21444020330431 is an equidigital number, since it uses as much as digits as its factorization.

21444020330431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 21444020330431 its reverse (13403302044412), we get a palindrome (34847322374843).

The spelling of 21444020330431 in words is "twenty-one trillion, four hundred forty-four billion, twenty million, three hundred thirty thousand, four hundred thirty-one".