21380441601 has 16 divisors (see below), whose sum is σ = 29287687104. Its totient is φ = 13863674304.

The previous prime is 21380441597. The next prime is 21380441723. The reversal of 21380441601 is 10614408312.

It is not a de Polignac number, because 21380441601 - 2² = 21380441597 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (21380448601) 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, 310975 + ... + 373451.

It is an arithmetic number, because the mean of its divisors is an integer number (1830480444).

Almost surely, 2^21380441601 is an apocalyptic number.

It is an amenable number.

21380441601 is a deficient number, since it is larger than the sum of its proper divisors (7907245503).

21380441601 is a wasteful number, since it uses less digits than its factorization.

21380441601 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65600.

The product of its (nonzero) digits is 4608, while the sum is 30.

Adding to 21380441601 its reverse (10614408312), we get a palindrome (31994849913).

The spelling of 21380441601 in words is "twenty-one billion, three hundred eighty million, four hundred forty-one thousand, six hundred one".