20211221112001 has 8 divisors (see below), whose sum is σ = 21275806939520. Its totient is φ = 19146719019312.

The previous prime is 20211221111863. The next prime is 20211221112007. The reversal of 20211221112001 is 10021112211202.

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

It is not a de Polignac number, because 20211221112001 - 2⁹ = 20211221111489 is a prime.

It is a super-3 number, since 3×20211221112001³ (a number of 41 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20211221112007) 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, 20437950 + ... + 21404023.

It is an arithmetic number, because the mean of its divisors is an integer number (2659475867440).

Almost surely, 2^{20211221112001} is an apocalyptic number.

It is an amenable number.

20211221112001 is a deficient number, since it is larger than the sum of its proper divisors (1064585827519).

20211221112001 is a wasteful number, since it uses less digits than its factorization.

20211221112001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41867415.

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

Adding to 20211221112001 its reverse (10021112211202), we get a palindrome (30232333323203).

The spelling of 20211221112001 in words is "twenty trillion, two hundred eleven billion, two hundred twenty-one million, one hundred twelve thousand, one".