21010066562 has 16 divisors (see below), whose sum is σ = 31749278400. Its totient is φ = 10427009520.

The previous prime is 21010066559. The next prime is 21010066579. The reversal of 21010066562 is 26566001012.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1970987 + ... + 1981617.

It is an arithmetic number, because the mean of its divisors is an integer number (1984329900).

Almost surely, 2^21010066562 is an apocalyptic number.

21010066562 is a deficient number, since it is larger than the sum of its proper divisors (10739211838).

21010066562 is a wasteful number, since it uses less digits than its factorization.

21010066562 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17881.

The product of its (nonzero) digits is 4320, while the sum is 29.

Adding to 21010066562 its reverse (26566001012), we get a palindrome (47576067574).

The spelling of 21010066562 in words is "twenty-one billion, ten million, sixty-six thousand, five hundred sixty-two".