20211212110021 has 8 divisors (see below), whose sum is σ = 20554526563200. Its totient is φ = 19867922708160.

The previous prime is 20211212109919. The next prime is 20211212110031. The reversal of 20211212110021 is 12001121211202.

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 20211212110021 - 2¹⁷ = 20211211978949 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20211212109977 and 20211212110004.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20211212110031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4631965 + ... + 7866226.

It is an arithmetic number, because the mean of its divisors is an integer number (2569315820400).

Almost surely, 2^{20211212110021} is an apocalyptic number.

It is an amenable number.

20211212110021 is a deficient number, since it is larger than the sum of its proper divisors (343314453179).

20211212110021 is a wasteful number, since it uses less digits than its factorization.

20211212110021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12525659.

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

Adding to 20211212110021 its reverse (12001121211202), we get a palindrome (32212333321223).

The spelling of 20211212110021 in words is "twenty trillion, two hundred eleven billion, two hundred twelve million, one hundred ten thousand, twenty-one".