20000221212101 has 16 divisors (see below), whose sum is σ = 21640199036400. Its totient is φ = 18374879351808.

The previous prime is 20000221212089. The next prime is 20000221212119. The reversal of 20000221212101 is 10121212200002.

It can be written as a sum of positive squares in 8 ways, for example, as 9451535692225 + 10548685519876 = 3074335^2 + 3247874^2 .

It is a cyclic number.

It is not a de Polignac number, because 20000221212101 - 2¹⁰ = 20000221211077 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20000221212161) 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 15 ways as a sum of consecutive naturals, for example, 694355 + ... + 6362591.

It is an arithmetic number, because the mean of its divisors is an integer number (1352512439775).

Almost surely, 2^{20000221212101} is an apocalyptic number.

It is an amenable number.

20000221212101 is a deficient number, since it is larger than the sum of its proper divisors (1639977824299).

20000221212101 is a wasteful number, since it uses less digits than its factorization.

20000221212101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5669528.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 20000221212101 its reverse (10121212200002), we get a palindrome (30121433412103).

It can be divided in two parts, 2000022 and 1212101, that added together give a palindrome (3212123).

The spelling of 20000221212101 in words is "twenty trillion, two hundred twenty-one million, two hundred twelve thousand, one hundred one".