21501441013120 has 64 divisors (see below), whose sum is σ = 53636746911840. Its totient is φ = 8226638295040.

The previous prime is 21501441013111. The next prime is 21501441013201. The reversal of 21501441013120 is 2131014410512.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 730333141 + ... + 730362580.

Almost surely, 2^{21501441013120} is an apocalyptic number.

21501441013120 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21501441013120 is an abundant number, since it is smaller than the sum of its proper divisors (32135305898720).

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

21501441013120 is a wasteful number, since it uses less digits than its factorization.

21501441013120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1460695763 (or 1460695751 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 25.

Adding to 21501441013120 its reverse (2131014410512), we get a palindrome (23632455423632).

The spelling of 21501441013120 in words is "twenty-one trillion, five hundred one billion, four hundred forty-one million, thirteen thousand, one hundred twenty".