21002050159535 has 16 divisors (see below), whose sum is σ = 25215191294976. Its totient is φ = 16793153707008.

The previous prime is 21002050159523. The next prime is 21002050159547. The reversal of 21002050159535 is 53595105020012.

It is an interprime number because it is at equal distance from previous prime (21002050159523) and next prime (21002050159547).

It is a cyclic number.

It is not a de Polignac number, because 21002050159535 - 2¹⁰ = 21002050158511 is a prime.

It is a super-2 number, since 2×21002050159535² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 205052957 + ... + 205155353.

It is an arithmetic number, because the mean of its divisors is an integer number (1575949455936).

Almost surely, 2^{21002050159535} is an apocalyptic number.

21002050159535 is a deficient number, since it is larger than the sum of its proper divisors (4213141135441).

21002050159535 is a wasteful number, since it uses less digits than its factorization.

21002050159535 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 122722.

The product of its (nonzero) digits is 67500, while the sum is 38.

Adding to 21002050159535 its reverse (53595105020012), we get a palindrome (74597155179547).

The spelling of 21002050159535 in words is "twenty-one trillion, two billion, fifty million, one hundred fifty-nine thousand, five hundred thirty-five".