21020243881268 has 24 divisors (see below), whose sum is σ = 37388731905504. Its totient is φ = 10337751496800.

The previous prime is 21020243881267. The next prime is 21020243881319. The reversal of 21020243881268 is 86218834202012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21020243881261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53555471 + ... + 53946537.

It is an arithmetic number, because the mean of its divisors is an integer number (1557863829396).

Almost surely, 2^{21020243881268} is an apocalyptic number.

It is an amenable number.

21020243881268 is a deficient number, since it is larger than the sum of its proper divisors (16368488024236).

21020243881268 is a wasteful number, since it uses less digits than its factorization.

21020243881268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 611423 (or 611421 counting only the distinct ones).

The product of its (nonzero) digits is 589824, while the sum is 47.

The spelling of 21020243881268 in words is "twenty-one trillion, twenty billion, two hundred forty-three million, eight hundred eighty-one thousand, two hundred sixty-eight".