20211221021201 has 8 divisors (see below), whose sum is σ = 23098566638784. Its totient is φ = 17323882485840.

The previous prime is 20211221021177. The next prime is 20211221021231. The reversal of 20211221021201 is 10212012211202.

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

It is not a de Polignac number, because 20211221021201 - 2⁶ = 20211221021137 is a prime.

It is a super-3 number, since 3×20211221021201³ (a number of 41 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 20211221021201.

It is not an unprimeable number, because it can be changed into a prime (20211221021231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7777106 + ... + 10045188.

It is an arithmetic number, because the mean of its divisors is an integer number (2887320829848).

Almost surely, 2^{20211221021201} is an apocalyptic number.

It is an amenable number.

20211221021201 is a deficient number, since it is larger than the sum of its proper divisors (2887345617583).

20211221021201 is a wasteful number, since it uses less digits than its factorization.

20211221021201 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3541111.

The product of its (nonzero) digits is 64, while the sum is 17.

Adding to 20211221021201 its reverse (10212012211202), we get a palindrome (30423233232403).

The spelling of 20211221021201 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, twenty-one thousand, two hundred one".