21521536033227 has 16 divisors (see below), whose sum is σ = 29088658220448. Its totient is φ = 14151054827520.

The previous prime is 21521536033199. The next prime is 21521536033243. The reversal of 21521536033227 is 72233063512512.

It is not a de Polignac number, because 21521536033227 - 2²² = 21521531838923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (21521536033267) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55837123 + ... + 56221235.

It is an arithmetic number, because the mean of its divisors is an integer number (1818041138778).

Almost surely, 2^{21521536033227} is an apocalyptic number.

21521536033227 is a deficient number, since it is larger than the sum of its proper divisors (7567122187221).

21521536033227 is a wasteful number, since it uses less digits than its factorization.

21521536033227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 640030.

The product of its (nonzero) digits is 453600, while the sum is 42.

Adding to 21521536033227 its reverse (72233063512512), we get a palindrome (93754599545739).

The spelling of 21521536033227 in words is "twenty-one trillion, five hundred twenty-one billion, five hundred thirty-six million, thirty-three thousand, two hundred twenty-seven".