21653064016532 has 24 divisors (see below), whose sum is σ = 40873836524136. Its totient is φ = 9977524558848.

The previous prime is 21653064016501. The next prime is 21653064016537. The reversal of 21653064016532 is 23561046035612.

It can be written as a sum of positive squares in 4 ways, for example, as 980092080016 + 20672971936516 = 989996^2 + 4546754^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653064016537) 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, 337411253 + ... + 337475420.

It is an arithmetic number, because the mean of its divisors is an integer number (1703076521839).

Almost surely, 2^{21653064016532} is an apocalyptic number.

It is an amenable number.

21653064016532 is a deficient number, since it is larger than the sum of its proper divisors (19220772507604).

21653064016532 is a wasteful number, since it uses less digits than its factorization.

21653064016532 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 674887307 (or 674887305 counting only the distinct ones).

The product of its (nonzero) digits is 777600, while the sum is 44.

The spelling of 21653064016532 in words is "twenty-one trillion, six hundred fifty-three billion, sixty-four million, sixteen thousand, five hundred thirty-two".