21652556566141 has 4 divisors (see below), whose sum is σ = 21686230838272. Its totient is φ = 21618882294012.

The previous prime is 21652556566021. The next prime is 21652556566183. The reversal of 21652556566141 is 14166565525612.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 21652556566141 - 2²⁵ = 21652523011709 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 (21652556566241) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16837135101 + ... + 16837136386.

It is an arithmetic number, because the mean of its divisors is an integer number (5421557709568).

Almost surely, 2^{21652556566141} is an apocalyptic number.

It is an amenable number.

21652556566141 is a deficient number, since it is larger than the sum of its proper divisors (33674272131).

21652556566141 is an equidigital number, since it uses as much as digits as its factorization.

21652556566141 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33674272130.

The product of its digits is 12960000, while the sum is 55.

The spelling of 21652556566141 in words is "twenty-one trillion, six hundred fifty-two billion, five hundred fifty-six million, five hundred sixty-six thousand, one hundred forty-one".