21535053220215 has 48 divisors (see below), whose sum is σ = 37698419528640. Its totient is φ = 11371218278400.

The previous prime is 21535053220201. The next prime is 21535053220217. The reversal of 21535053220215 is 51202235053512.

21535053220215 is a `hidden beast` number, since 2 + 1 + 53 + 50 + 532 + 2 + 0 + 21 + 5 = 666.

It is not a de Polignac number, because 21535053220215 - 2⁴ = 21535053220199 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 21535053220215.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21535053220217) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 148135254 + ... + 148280556.

It is an arithmetic number, because the mean of its divisors is an integer number (785383740180).

Almost surely, 2^{21535053220215} is an apocalyptic number.

21535053220215 is a deficient number, since it is larger than the sum of its proper divisors (16163366308425).

21535053220215 is a wasteful number, since it uses less digits than its factorization.

21535053220215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 178024 (or 178021 counting only the distinct ones).

The product of its (nonzero) digits is 90000, while the sum is 36.

Adding to 21535053220215 its reverse (51202235053512), we get a palindrome (72737288273727).

The spelling of 21535053220215 in words is "twenty-one trillion, five hundred thirty-five billion, fifty-three million, two hundred twenty thousand, two hundred fifteen".