21652405602161 has 2 divisors, whose sum is σ = 21652405602162. Its totient is φ = 21652405602160.

The previous prime is 21652405602053. The next prime is 21652405602181. The reversal of 21652405602161 is 16120650425612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11884780499761 + 9767625102400 = 3447431^2 + 3125320^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-21652405602161 is a prime.

It is not a weakly prime, because it can be changed into another prime (21652405602181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10826202801080 + 10826202801081.

It is an arithmetic number, because the mean of its divisors is an integer number (10826202801081).

Almost surely, 2^{21652405602161} is an apocalyptic number.

It is an amenable number.

21652405602161 is a deficient number, since it is larger than the sum of its proper divisors (1).

21652405602161 is an equidigital number, since it uses as much as digits as its factorization.

21652405602161 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 172800, while the sum is 41.

The spelling of 21652405602161 in words is "twenty-one trillion, six hundred fifty-two billion, four hundred five million, six hundred two thousand, one hundred sixty-one".