21653041614265 has 4 divisors (see below), whose sum is σ = 25983649937124. Its totient is φ = 17322433291408.

The previous prime is 21653041614251. The next prime is 21653041614271. The reversal of 21653041614265 is 56241614035612.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 6106888748944 + 15546152865321 = 2471212^2 + 3942861^2 .

It is a cyclic number.

It is not a de Polignac number, because 21653041614265 - 2¹⁷ = 21653041483193 is a prime.

It is a super-2 number, since 2×21653041614265² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2165304161422 + ... + 2165304161431.

It is an arithmetic number, because the mean of its divisors is an integer number (6495912484281).

Almost surely, 2^{21653041614265} is an apocalyptic number.

It is an amenable number.

21653041614265 is a deficient number, since it is larger than the sum of its proper divisors (4330608322859).

21653041614265 is an equidigital number, since it uses as much as digits as its factorization.

21653041614265 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4330608322858.

The product of its (nonzero) digits is 1036800, while the sum is 46.

Adding to 21653041614265 its reverse (56241614035612), we get a palindrome (77894655649877).

The spelling of 21653041614265 in words is "twenty-one trillion, six hundred fifty-three billion, forty-one million, six hundred fourteen thousand, two hundred sixty-five".