21320591361576 has 128 divisors (see below), whose sum is σ = 60490358288640. Its totient is φ = 6212828160000.

The previous prime is 21320591361481. The next prime is 21320591361581. The reversal of 21320591361576 is 67516319502312.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13983625 + ... + 15433176.

It is an arithmetic number, because the mean of its divisors is an integer number (472580924130).

Almost surely, 2^{21320591361576} is an apocalyptic number.

21320591361576 is a gapful number since it is divisible by the number (26) formed by its first and last digit.

It is an amenable number.

21320591361576 is an abundant number, since it is smaller than the sum of its proper divisors (39169766927064).

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

21320591361576 is a wasteful number, since it uses less digits than its factorization.

21320591361576 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 29416947 (or 29416943 counting only the distinct ones).

The product of its (nonzero) digits is 2041200, while the sum is 51.

The spelling of 21320591361576 in words is "twenty-one trillion, three hundred twenty billion, five hundred ninety-one million, three hundred sixty-one thousand, five hundred seventy-six".