21050331212544 has 72 divisors (see below), whose sum is σ = 56028360185280. Its totient is φ = 7016303551488.

The previous prime is 21050331212531. The next prime is 21050331212579. The reversal of 21050331212544 is 44521213305012.

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 7 ways as a sum of consecutive naturals, for example, 10555779 + ... + 12390525.

It is an arithmetic number, because the mean of its divisors is an integer number (778171669240).

Almost surely, 2^{21050331212544} is an apocalyptic number.

21050331212544 is a gapful number since it is divisible by the number (24) formed by its first and last digit.

It is an amenable number.

21050331212544 is an abundant number, since it is smaller than the sum of its proper divisors (34978028972736).

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

21050331212544 is a wasteful number, since it uses less digits than its factorization.

21050331212544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1849705 (or 1849691 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 33.

Adding to 21050331212544 its reverse (44521213305012), we get a palindrome (65571544517556).

The spelling of 21050331212544 in words is "twenty-one trillion, fifty billion, three hundred thirty-one million, two hundred twelve thousand, five hundred forty-four".