21552434542044 has 96 divisors (see below), whose sum is σ = 63902837644800. Its totient is φ = 6153617537280.

The previous prime is 21552434542007. The next prime is 21552434542057. The reversal of 21552434542044 is 44024543425512.

21552434542044 is a `hidden beast` number, since 2 + 1 + 5 + 5 + 2 + 434 + 5 + 4 + 204 + 4 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8666877 + ... + 10872884.

It is an arithmetic number, because the mean of its divisors is an integer number (665654558800).

Almost surely, 2^{21552434542044} is an apocalyptic number.

It is an amenable number.

21552434542044 is an abundant number, since it is smaller than the sum of its proper divisors (42350403102756).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

21552434542044 is a wasteful number, since it uses less digits than its factorization.

21552434542044 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19541240 (or 19541232 counting only the distinct ones).

The product of its (nonzero) digits is 3072000, while the sum is 45.

Adding to 21552434542044 its reverse (44024543425512), we get a palindrome (65576977967556).

The spelling of 21552434542044 in words is "twenty-one trillion, five hundred fifty-two billion, four hundred thirty-four million, five hundred forty-two thousand, forty-four".