21715142201065 has 32 divisors (see below), whose sum is σ = 27947119150080. Its totient is φ = 16139295304704.

The previous prime is 21715142201059. The next prime is 21715142201089. The reversal of 21715142201065 is 56010224151712.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 21715142201065 - 2⁹ = 21715142200553 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 27089452 + ... + 27879538.

It is an arithmetic number, because the mean of its divisors is an integer number (873347473440).

Almost surely, 2^{21715142201065} is an apocalyptic number.

It is an amenable number.

21715142201065 is a deficient number, since it is larger than the sum of its proper divisors (6231976949015).

21715142201065 is a wasteful number, since it uses less digits than its factorization.

21715142201065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 794281.

The product of its (nonzero) digits is 33600, while the sum is 37.

Adding to 21715142201065 its reverse (56010224151712), we get a palindrome (77725366352777).

The spelling of 21715142201065 in words is "twenty-one trillion, seven hundred fifteen billion, one hundred forty-two million, two hundred one thousand, sixty-five".