21221535344135 has 64 divisors (see below), whose sum is σ = 30870089902080. Its totient is φ = 13689690094080.

The previous prime is 21221535344123. The next prime is 21221535344203. The reversal of 21221535344135 is 53144353512212.

It is not a de Polignac number, because 21221535344135 - 2¹⁶ = 21221535278599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 21221535344092 and 21221535344101.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 833741069 + ... + 833766521.

It is an arithmetic number, because the mean of its divisors is an integer number (482345154720).

Almost surely, 2^{21221535344135} is an apocalyptic number.

21221535344135 is a deficient number, since it is larger than the sum of its proper divisors (9648554557945).

21221535344135 is a wasteful number, since it uses less digits than its factorization.

21221535344135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42528.

The product of its digits is 432000, while the sum is 41.

Adding to 21221535344135 its reverse (53144353512212), we get a palindrome (74365888856347).

The spelling of 21221535344135 in words is "twenty-one trillion, two hundred twenty-one billion, five hundred thirty-five million, three hundred forty-four thousand, one hundred thirty-five".