20201221210101 has 8 divisors (see below), whose sum is σ = 26934988276224. Its totient is φ = 13467467475360.

The previous prime is 20201221210097. The next prime is 20201221210109. The reversal of 20201221210101 is 10101212210202.

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

It is not a de Polignac number, because 20201221210101 - 2² = 20201221210097 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20201221210109) 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, 1012081 + ... + 6436361.

It is an arithmetic number, because the mean of its divisors is an integer number (3366873534528).

Almost surely, 2^{20201221210101} is an apocalyptic number.

It is an amenable number.

20201221210101 is a deficient number, since it is larger than the sum of its proper divisors (6733767066123).

20201221210101 is a wasteful number, since it uses less digits than its factorization.

20201221210101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6665691.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 20201221210101 its reverse (10101212210202), we get a palindrome (30302433420303).

The spelling of 20201221210101 in words is "twenty trillion, two hundred one billion, two hundred twenty-one million, two hundred ten thousand, one hundred one".