21155144075760 has 40 divisors (see below), whose sum is σ = 65580946635600. Its totient is φ = 5641371753472.

The previous prime is 21155144075683. The next prime is 21155144075777. The reversal of 21155144075760 is 6757044155112.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (48).

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, 44073216585 + ... + 44073217064.

It is an arithmetic number, because the mean of its divisors is an integer number (1639523665890).

Almost surely, 2^{21155144075760} is an apocalyptic number.

21155144075760 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

21155144075760 is an abundant number, since it is smaller than the sum of its proper divisors (44425802559840).

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

21155144075760 is a wasteful number, since it uses less digits than its factorization.

21155144075760 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88146433665 (or 88146433659 counting only the distinct ones).

The product of its (nonzero) digits is 1176000, while the sum is 48.

The spelling of 21155144075760 in words is "twenty-one trillion, one hundred fifty-five billion, one hundred forty-four million, seventy-five thousand, seven hundred sixty".