21454445344532 has 24 divisors (see below), whose sum is σ = 37827776747880. Its totient is φ = 10646544097280.

The previous prime is 21454445344531. The next prime is 21454445344547. The reversal of 21454445344532 is 23544354445412.

It can be written as a sum of positive squares in 4 ways, for example, as 8173858128016 + 13280587216516 = 2858996^2 + 3644254^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21454445344531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1912907 + ... + 6824082.

It is an arithmetic number, because the mean of its divisors is an integer number (1576157364495).

Almost surely, 2^{21454445344532} is an apocalyptic number.

It is an amenable number.

21454445344532 is a deficient number, since it is larger than the sum of its proper divisors (16373331403348).

21454445344532 is a wasteful number, since it uses less digits than its factorization.

21454445344532 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8741611 (or 8741609 counting only the distinct ones).

The product of its digits is 18432000, while the sum is 50.

Adding to 21454445344532 its reverse (23544354445412), we get a palindrome (44998799789944).

The spelling of 21454445344532 in words is "twenty-one trillion, four hundred fifty-four billion, four hundred forty-five million, three hundred forty-four thousand, five hundred thirty-two".