21653060013 has 12 divisors (see below), whose sum is σ = 33682537980. Its totient is φ = 13324959936.

The previous prime is 21653059991. The next prime is 21653060027. The reversal of 21653060013 is 31006035612.

21653060013 is a `hidden beast` number, since 2 + 1 + 6 + 53 + 0 + 600 + 1 + 3 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5776304004 + 15876756009 = 76002^2 + 126003^2 .

It is not a de Polignac number, because 21653060013 - 2⁹ = 21653059501 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21653060083) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 92534328 + ... + 92534561.

It is an arithmetic number, because the mean of its divisors is an integer number (2806878165).

Almost surely, 2^21653060013 is an apocalyptic number.

It is an amenable number.

21653060013 is a deficient number, since it is larger than the sum of its proper divisors (12029477967).

21653060013 is a wasteful number, since it uses less digits than its factorization.

21653060013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 185068908 (or 185068905 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 27.

Adding to 21653060013 its reverse (31006035612), we get a palindrome (52659095625).

The spelling of 21653060013 in words is "twenty-one billion, six hundred fifty-three million, sixty thousand, thirteen".