21071552045280 has 384 divisors, whose sum is σ = 74216751759360. Its totient is φ = 4982124349440.

The previous prime is 21071552045263. The next prime is 21071552045309. The reversal of 21071552045280 is 8254025517012.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 39296737 + ... + 39829343.

It is an arithmetic number, because the mean of its divisors is an integer number (193272791040).

Almost surely, 2^{21071552045280} is an apocalyptic number.

21071552045280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 21071552045280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37108375879680).

21071552045280 is an abundant number, since it is smaller than the sum of its proper divisors (53145199714080).

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

21071552045280 is a wasteful number, since it uses less digits than its factorization.

21071552045280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 532822 (or 532814 counting only the distinct ones).

The product of its (nonzero) digits is 224000, while the sum is 42.

The spelling of 21071552045280 in words is "twenty-one trillion, seventy-one billion, five hundred fifty-two million, forty-five thousand, two hundred eighty".