20011220220121 has 8 divisors (see below), whose sum is σ = 22132992011144. Its totient is φ = 17972655166080.

The previous prime is 20011220220109. The next prime is 20011220220197. The reversal of 20011220220121 is 12102202211002.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8732403244096 + 11278816976025 = 2955064^2 + 3358395^2 .

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-20011220220121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20011220220095 and 20011220220104.

It is not an unprimeable number, because it can be changed into a prime (20011220220521) 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, 20801683740 + ... + 20801684701.

It is an arithmetic number, because the mean of its divisors is an integer number (2766624001393).

Almost surely, 2^{20011220220121} is an apocalyptic number.

It is an amenable number.

20011220220121 is a deficient number, since it is larger than the sum of its proper divisors (2121771791023).

20011220220121 is a wasteful number, since it uses less digits than its factorization.

20011220220121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41603368491.

The product of its (nonzero) digits is 64, while the sum is 16.

Adding to 20011220220121 its reverse (12102202211002), we get a palindrome (32113422431123).

The spelling of 20011220220121 in words is "twenty trillion, eleven billion, two hundred twenty million, two hundred twenty thousand, one hundred twenty-one".