21023260056643 has 16 divisors (see below), whose sum is σ = 22647958250400. Its totient is φ = 19399637986560.

The previous prime is 21023260056629. The next prime is 21023260056661. The reversal of 21023260056643 is 34665006232012.

It is not a de Polignac number, because 21023260056643 - 2¹³ = 21023260048451 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 21023260056596 and 21023260056605.

It is not an unprimeable number, because it can be changed into a prime (21023260056943) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 559542048 + ... + 559579618.

It is an arithmetic number, because the mean of its divisors is an integer number (1415497390650).

Almost surely, 2^{21023260056643} is an apocalyptic number.

21023260056643 is a deficient number, since it is larger than the sum of its proper divisors (1624698193757).

21023260056643 is a wasteful number, since it uses less digits than its factorization.

21023260056643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50742.

The product of its (nonzero) digits is 311040, while the sum is 40.

Adding to 21023260056643 its reverse (34665006232012), we get a palindrome (55688266288655).

The spelling of 21023260056643 in words is "twenty-one trillion, twenty-three billion, two hundred sixty million, fifty-six thousand, six hundred forty-three".