20211221200201 has 8 divisors (see below), whose sum is σ = 20682612432000. Its totient is φ = 19741553520528.

The previous prime is 20211221200193. The next prime is 20211221200271. The reversal of 20211221200201 is 10200212211202.

It is a happy number.

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 20211221200201 - 2³ = 20211221200193 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211221200271) 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, 430864306 + ... + 430911211.

It is an arithmetic number, because the mean of its divisors is an integer number (2585326554000).

Almost surely, 2^{20211221200201} is an apocalyptic number.

It is an amenable number.

20211221200201 is a deficient number, since it is larger than the sum of its proper divisors (471391231799).

20211221200201 is an equidigital number, since it uses as much as digits as its factorization.

20211221200201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 861776063.

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

Adding to 20211221200201 its reverse (10200212211202), we get a palindrome (30411433411403).

The spelling of 20211221200201 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, two hundred thousand, two hundred one".