21655613242141 has 8 divisors (see below), whose sum is σ = 21680556436224. Its totient is φ = 21630672619920.

The previous prime is 21655613242121. The next prime is 21655613242181. The reversal of 21655613242141 is 14124231655612.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21655613242141 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21655613242121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 16469080 + ... + 17735326.

It is an arithmetic number, because the mean of its divisors is an integer number (2710069554528).

Almost surely, 2^{21655613242141} is an apocalyptic number.

It is an amenable number.

21655613242141 is a deficient number, since it is larger than the sum of its proper divisors (24943194083).

21655613242141 is a wasteful number, since it uses less digits than its factorization.

21655613242141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1285931.

The product of its digits is 345600, while the sum is 43.

Adding to 21655613242141 its reverse (14124231655612), we get a palindrome (35779844897753).

The spelling of 21655613242141 in words is "twenty-one trillion, six hundred fifty-five billion, six hundred thirteen million, two hundred forty-two thousand, one hundred forty-one".