21061210366 has 8 divisors (see below), whose sum is σ = 36104932080. Its totient is φ = 9026233008.

The previous prime is 21061210351. The next prime is 21061210367. The reversal of 21061210366 is 66301216012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (21061210367) 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 3 ways as a sum of consecutive naturals, for example, 752186071 + ... + 752186098.

It is an arithmetic number, because the mean of its divisors is an integer number (4513116510).

Almost surely, 2^21061210366 is an apocalyptic number.

21061210366 is a deficient number, since it is larger than the sum of its proper divisors (15043721714).

21061210366 is a wasteful number, since it uses less digits than its factorization.

21061210366 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1504372178.

The product of its (nonzero) digits is 2592, while the sum is 28.

Adding to 21061210366 its reverse (66301216012), we get a palindrome (87362426378).

The spelling of 21061210366 in words is "twenty-one billion, sixty-one million, two hundred ten thousand, three hundred sixty-six".