21560520362641 has 16 divisors (see below), whose sum is σ = 23254971083344. Its totient is φ = 19871208935424.

The previous prime is 21560520362593. The next prime is 21560520362681. The reversal of 21560520362641 is 14626302506512.

It can be written as a sum of positive squares in 8 ways, for example, as 8509641602641 + 13050878760000 = 2917129^2 + 3612600^2 .

It is a cyclic number.

It is not a de Polignac number, because 21560520362641 - 2¹¹ = 21560520360593 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21560520362681) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159312895 + ... + 159448171.

It is an arithmetic number, because the mean of its divisors is an integer number (1453435692709).

Almost surely, 2^{21560520362641} is an apocalyptic number.

It is an amenable number.

21560520362641 is a deficient number, since it is larger than the sum of its proper divisors (1694450720703).

21560520362641 is a wasteful number, since it uses less digits than its factorization.

21560520362641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 154180.

The product of its (nonzero) digits is 518400, while the sum is 43.

The spelling of 21560520362641 in words is "twenty-one trillion, five hundred sixty billion, five hundred twenty million, three hundred sixty-two thousand, six hundred forty-one".