21653041605410 has 16 divisors (see below), whose sum is σ = 41268149883576. Its totient is φ = 8151733310208.

The previous prime is 21653041605409. The next prime is 21653041605413. The reversal of 21653041605410 is 1450614035612.

It can be written as a sum of positive squares in 4 ways, for example, as 14714458699249 + 6938582906161 = 3835943^2 + 2634119^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21653041605413) 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, 63685416317 + ... + 63685416656.

Almost surely, 2^{21653041605410} is an apocalyptic number.

21653041605410 is a deficient number, since it is larger than the sum of its proper divisors (19615108278166).

21653041605410 is a wasteful number, since it uses less digits than its factorization.

21653041605410 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127370832997.

The product of its (nonzero) digits is 86400, while the sum is 38.

The spelling of 21653041605410 in words is "twenty-one trillion, six hundred fifty-three billion, forty-one million, six hundred five thousand, four hundred ten".