21655542130202 has 8 divisors (see below), whose sum is σ = 32770776144276. Its totient is φ = 10731950082112.

The previous prime is 21655542130181. The next prime is 21655542130219. The reversal of 21655542130202 is 20203124555612.

It can be written as a sum of positive squares in 2 ways, for example, as 17773298473921 + 3882243656281 = 4215839^2 + 1970341^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

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, 47910491213 + ... + 47910491664.

Almost surely, 2^{21655542130202} is an apocalyptic number.

21655542130202 is a deficient number, since it is larger than the sum of its proper divisors (11115234014074).

21655542130202 is a wasteful number, since it uses less digits than its factorization.

21655542130202 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95820982992.

The product of its (nonzero) digits is 144000, while the sum is 38.

Adding to 21655542130202 its reverse (20203124555612), we get a palindrome (41858666685814).

The spelling of 21655542130202 in words is "twenty-one trillion, six hundred fifty-five billion, five hundred forty-two million, one hundred thirty thousand, two hundred two".