21089863546 has 32 divisors (see below), whose sum is σ = 32978826000. Its totient is φ = 10102858752.

The previous prime is 21089863541. The next prime is 21089863577. The reversal of 21089863546 is 64536898012.

It can be written as a sum of positive squares in 8 ways, for example, as 10229097321 + 10860766225 = 101139^2 + 104215^2 .

It is a junction number, because it is equal to n+sod(n) for n = 21089863493 and 21089863502.

It is not an unprimeable number, because it can be changed into a prime (21089863541) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4207890 + ... + 4212898.

Almost surely, 2^21089863546 is an apocalyptic number.

21089863546 is a deficient number, since it is larger than the sum of its proper divisors (11888962454).

21089863546 is a wasteful number, since it uses less digits than its factorization.

21089863546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5586.

The product of its (nonzero) digits is 2488320, while the sum is 52.

The spelling of 21089863546 in words is "twenty-one billion, eighty-nine million, eight hundred sixty-three thousand, five hundred forty-six".