21000113013544 has 64 divisors (see below), whose sum is σ = 47369636668800. Its totient is φ = 8526188749824.

The previous prime is 21000113013499. The next prime is 21000113013577. The reversal of 21000113013544 is 44531031100012.

It is a super-3 number, since 3×21000113013544³ (a number of 41 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

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 15 ways as a sum of consecutive naturals, for example, 61107604 + ... + 61450300.

It is an arithmetic number, because the mean of its divisors is an integer number (740150572950).

Almost surely, 2^{21000113013544} is an apocalyptic number.

It is an amenable number.

21000113013544 is an abundant number, since it is smaller than the sum of its proper divisors (26369523655256).

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

21000113013544 is a wasteful number, since it uses less digits than its factorization.

21000113013544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 400322 (or 400318 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

Adding to 21000113013544 its reverse (44531031100012), we get a palindrome (65531144113556).

The spelling of 21000113013544 in words is "twenty-one trillion, one hundred thirteen million, thirteen thousand, five hundred forty-four".