21601445441 has 8 divisors (see below), whose sum is σ = 22348698600. Its totient is φ = 20854350720.

The previous prime is 21601445407. The next prime is 21601445449. The reversal of 21601445441 is 14454410612.

It can be written as a sum of positive squares in 4 ways, for example, as 167314225 + 21434131216 = 12935^2 + 146404^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 21601445441 - 2³⁰ = 20527703617 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21601445398 and 21601445407.

It is not an unprimeable number, because it can be changed into a prime (21601445449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 282221 + ... + 350501.

It is an arithmetic number, because the mean of its divisors is an integer number (2793587325).

Almost surely, 2^21601445441 is an apocalyptic number.

It is an amenable number.

21601445441 is a deficient number, since it is larger than the sum of its proper divisors (747253159).

21601445441 is a wasteful number, since it uses less digits than its factorization.

21601445441 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79219.

The product of its (nonzero) digits is 15360, while the sum is 32.

The spelling of 21601445441 in words is "twenty-one billion, six hundred one million, four hundred forty-five thousand, four hundred forty-one".