21601036441 has 2 divisors, whose sum is σ = 21601036442. Its totient is φ = 21601036440.

The previous prime is 21601036423. The next prime is 21601036453. The reversal of 21601036441 is 14463010612.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 21497424400 + 103612041 = 146620^2 + 10179^2 .

It is a cyclic number.

It is not a de Polignac number, because 21601036441 - 2²⁵ = 21567482009 is a prime.

It is not a weakly prime, because it can be changed into another prime (21601036241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10800518220 + 10800518221.

It is an arithmetic number, because the mean of its divisors is an integer number (10800518221).

Almost surely, 2^21601036441 is an apocalyptic number.

It is an amenable number.

21601036441 is a deficient number, since it is larger than the sum of its proper divisors (1).

21601036441 is an equidigital number, since it uses as much as digits as its factorization.

21601036441 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3456, while the sum is 28.

The spelling of 21601036441 in words is "twenty-one billion, six hundred one million, thirty-six thousand, four hundred forty-one".