21533525533244 has 24 divisors (see below), whose sum is σ = 37745790384960. Its totient is φ = 10749014963456.

The previous prime is 21533525533229. The next prime is 21533525533291. The reversal of 21533525533244 is 44233552533512.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109004192 + ... + 109201560.

It is an arithmetic number, because the mean of its divisors is an integer number (1572741266040).

Almost surely, 2^{21533525533244} is an apocalyptic number.

It is an amenable number.

21533525533244 is a deficient number, since it is larger than the sum of its proper divisors (16212264851716).

21533525533244 is a wasteful number, since it uses less digits than its factorization.

21533525533244 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242197 (or 242195 counting only the distinct ones).

The product of its digits is 6480000, while the sum is 47.

The spelling of 21533525533244 in words is "twenty-one trillion, five hundred thirty-three billion, five hundred twenty-five million, five hundred thirty-three thousand, two hundred forty-four".