20000221100021 has 8 divisors (see below), whose sum is σ = 20005115492544. Its totient is φ = 19995327321120.

The previous prime is 20000221099997. The next prime is 20000221100071. The reversal of 20000221100021 is 12000112200002.

It is a happy number.

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-20000221100021 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20000221099975 and 20000221100011.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000221100071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 68777696 + ... + 69067878.

It is an arithmetic number, because the mean of its divisors is an integer number (2500639436568).

Almost surely, 2^{20000221100021} is an apocalyptic number.

It is an amenable number.

20000221100021 is a deficient number, since it is larger than the sum of its proper divisors (4894392523).

20000221100021 is an equidigital number, since it uses as much as digits as its factorization.

20000221100021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306811.

The product of its (nonzero) digits is 16, while the sum is 11.

Adding to 20000221100021 its reverse (12000112200002), we get a palindrome (32000333300023).

The spelling of 20000221100021 in words is "twenty trillion, two hundred twenty-one million, one hundred thousand, twenty-one".