21152544613144 has 32 divisors (see below), whose sum is σ = 45472626950400. Its totient is φ = 9036227135520.

The previous prime is 21152544613139. The next prime is 21152544613147. The reversal of 21152544613144 is 44131644525112.

It is a super-2 number, since 2×21152544613144² (a number of 27 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 21152544613144.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21152544613147) 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 7 ways as a sum of consecutive naturals, for example, 607255914 + ... + 607290745.

It is an arithmetic number, because the mean of its divisors is an integer number (1421019592200).

Almost surely, 2^{21152544613144} is an apocalyptic number.

It is an amenable number.

21152544613144 is an abundant number, since it is smaller than the sum of its proper divisors (24320082337256).

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

21152544613144 is a wasteful number, since it uses less digits than its factorization.

21152544613144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1214546983 (or 1214546979 counting only the distinct ones).

The product of its digits is 460800, while the sum is 43.

The spelling of 21152544613144 in words is "twenty-one trillion, one hundred fifty-two billion, five hundred forty-four million, six hundred thirteen thousand, one hundred forty-four".