20012100002221 has 8 divisors (see below), whose sum is σ = 20028072843000. Its totient is φ = 19996133337600.

The previous prime is 20012100002161. The next prime is 20012100002239. The reversal of 20012100002221 is 12220000121002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 2440200148996 + 17571899853225 = 1562114^2 + 4191885^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 20012100002221 - 2¹⁵ = 20012099969453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20012100002261) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4949871 + ... + 8032771.

It is an arithmetic number, because the mean of its divisors is an integer number (2503509105375).

Almost surely, 2^{20012100002221} is an apocalyptic number.

It is an amenable number.

20012100002221 is a deficient number, since it is larger than the sum of its proper divisors (15972840779).

20012100002221 is a wasteful number, since it uses less digits than its factorization.

20012100002221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3088079.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20012100002221 its reverse (12220000121002), we get a palindrome (32232100123223).

The spelling of 20012100002221 in words is "twenty trillion, twelve billion, one hundred million, two thousand, two hundred twenty-one".