21380441602 has 8 divisors (see below), whose sum is σ = 34537636476. Its totient is φ = 9867896112.

The previous prime is 21380441597. The next prime is 21380441723. The reversal of 21380441602 is 20614408312.

It can be written as a sum of positive squares in 2 ways, for example, as 21155411601 + 225030001 = 145449^2 + 15001^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 411162313 + ... + 411162364.

Almost surely, 2^21380441602 is an apocalyptic number.

21380441602 is a deficient number, since it is larger than the sum of its proper divisors (13157194874).

21380441602 is a wasteful number, since it uses less digits than its factorization.

21380441602 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 822324692.

The product of its (nonzero) digits is 9216, while the sum is 31.

Adding to 21380441602 its reverse (20614408312), we get a palindrome (41994849914).

The spelling of 21380441602 in words is "twenty-one billion, three hundred eighty million, four hundred forty-one thousand, six hundred two".