21340105445524 has 12 divisors (see below), whose sum is σ = 37345898012500. Its totient is φ = 10669848870528.

The previous prime is 21340105445429. The next prime is 21340105445543. The reversal of 21340105445524 is 42554450104312.

It can be written as a sum of positive squares in 2 ways, for example, as 7716550625424 + 13623554820100 = 2777868^2 + 3691010^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 50727399 + ... + 51146350.

Almost surely, 2^{21340105445524} is an apocalyptic number.

It is an amenable number.

21340105445524 is a deficient number, since it is larger than the sum of its proper divisors (16005792566976).

21340105445524 is a wasteful number, since it uses less digits than its factorization.

21340105445524 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101926122 (or 101926120 counting only the distinct ones).

The product of its (nonzero) digits is 384000, while the sum is 40.

Adding to 21340105445524 its reverse (42554450104312), we get a palindrome (63894555549836).

The spelling of 21340105445524 in words is "twenty-one trillion, three hundred forty billion, one hundred five million, four hundred forty-five thousand, five hundred twenty-four".