21653064016533 has 6 divisors (see below), whose sum is σ = 31276648023894. Its totient is φ = 14435376011016.

The previous prime is 21653064016501. The next prime is 21653064016537. The reversal of 21653064016533 is 33561046035612.

21653064016533 is a `hidden beast` number, since 2 + 1 + 6 + 53 + 0 + 64 + 0 + 1 + 6 + 533 = 666.

It can be written as a sum of positive squares in only one way, i.e., 20063429725284 + 1589634291249 = 4479222^2 + 1260807^2 .

It is not a de Polignac number, because 21653064016533 - 2⁵ = 21653064016501 is a prime.

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

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1202948000910 + ... + 1202948000927.

It is an arithmetic number, because the mean of its divisors is an integer number (5212774670649).

Almost surely, 2^{21653064016533} is an apocalyptic number.

It is an amenable number.

21653064016533 is a deficient number, since it is larger than the sum of its proper divisors (9623584007361).

21653064016533 is a wasteful number, since it uses less digits than its factorization.

21653064016533 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2405896001843 (or 2405896001840 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 21653064016533 in words is "twenty-one trillion, six hundred fifty-three billion, sixty-four million, sixteen thousand, five hundred thirty-three".