21653064540344 has 8 divisors (see below), whose sum is σ = 40599496013160. Its totient is φ = 10826532270168.

The previous prime is 21653064540343. The next prime is 21653064540377. The reversal of 21653064540344 is 44304546035612.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653064540343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1353316533764 + ... + 1353316533779.

It is an arithmetic number, because the mean of its divisors is an integer number (5074937001645).

Almost surely, 2^{21653064540344} is an apocalyptic number.

It is an amenable number.

21653064540344 is a deficient number, since it is larger than the sum of its proper divisors (18946431472816).

21653064540344 is a wasteful number, since it uses less digits than its factorization.

21653064540344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2706633067549 (or 2706633067545 counting only the distinct ones).

The product of its (nonzero) digits is 4147200, while the sum is 47.

The spelling of 21653064540344 in words is "twenty-one trillion, six hundred fifty-three billion, sixty-four million, five hundred forty thousand, three hundred forty-four".