21655141441 has 16 divisors (see below), whose sum is σ = 22544552448. Its totient is φ = 20783304000.

The previous prime is 21655141439. The next prime is 21655141451. The reversal of 21655141441 is 14414155612.

It is a cyclic number.

It is not a de Polignac number, because 21655141441 - 2¹ = 21655141439 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21655141397 and 21655141406.

It is not an unprimeable number, because it can be changed into a prime (21655141451) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1002036 + ... + 1023418.

It is an arithmetic number, because the mean of its divisors is an integer number (1409034528).

Almost surely, 2^21655141441 is an apocalyptic number.

It is an amenable number.

21655141441 is a deficient number, since it is larger than the sum of its proper divisors (889411007).

21655141441 is a wasteful number, since it uses less digits than its factorization.

21655141441 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21792.

The product of its digits is 19200, while the sum is 34.

The spelling of 21655141441 in words is "twenty-one billion, six hundred fifty-five million, one hundred forty-one thousand, four hundred forty-one".