20000221002100 has 18 divisors (see below), whose sum is σ = 43400479574774. Its totient is φ = 8000088400800.

The previous prime is 20000221002049. The next prime is 20000221002119. The reversal of 20000221002100 is 120012200002.

It can be written as a sum of positive squares in 3 ways, for example, as 770838344676 + 19229382657424 = 877974^2 + 4385132^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 100001104911 + ... + 100001105110.

Almost surely, 2^{20000221002100} is an apocalyptic number.

20000221002100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20000221002100 is an abundant number, since it is smaller than the sum of its proper divisors (23400258572674).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

20000221002100 is a wasteful number, since it uses less digits than its factorization.

20000221002100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 200002210035 (or 200002210028 counting only the distinct ones).

The product of its (nonzero) digits is 16, while the sum is 10.

Adding to 20000221002100 its reverse (120012200002), we get a palindrome (20120233202102).

The spelling of 20000221002100 in words is "twenty trillion, two hundred twenty-one million, two thousand, one hundred".