20011101221221 has 8 divisors (see below), whose sum is σ = 21832786381824. Its totient is φ = 18189831750720.

The previous prime is 20011101221207. The next prime is 20011101221261. The reversal of 20011101221221 is 12212210111002.

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 20011101221221 - 2⁷ = 20011101221093 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 20011101221195 and 20011101221204.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20011101221261) 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, 103821861 + ... + 104014426.

It is an arithmetic number, because the mean of its divisors is an integer number (2729098297728).

Almost surely, 2^{20011101221221} is an apocalyptic number.

It is an amenable number.

20011101221221 is a deficient number, since it is larger than the sum of its proper divisors (1821685160603).

20011101221221 is a wasteful number, since it uses less digits than its factorization.

20011101221221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 207845051.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 20011101221221 its reverse (12212210111002), we get a palindrome (32223311332223).

The spelling of 20011101221221 in words is "twenty trillion, eleven billion, one hundred one million, two hundred twenty-one thousand, two hundred twenty-one".