20621066321 has 8 divisors (see below), whose sum is σ = 20657859840. Its totient is φ = 20584306912.

The previous prime is 20621066311. The next prime is 20621066357. The reversal of 20621066321 is 12366012602.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-20621066321 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (20621066311) by changing a digit.

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, 1401320 + ... + 1415958.

It is an arithmetic number, because the mean of its divisors is an integer number (2582232480).

Almost surely, 2^20621066321 is an apocalyptic number.

It is an amenable number.

20621066321 is a deficient number, since it is larger than the sum of its proper divisors (36793519).

20621066321 is a wasteful number, since it uses less digits than its factorization.

20621066321 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17055.

The product of its (nonzero) digits is 5184, while the sum is 29.

Adding to 20621066321 its reverse (12366012602), we get a palindrome (32987078923).

The spelling of 20621066321 in words is "twenty billion, six hundred twenty-one million, sixty-six thousand, three hundred twenty-one".