20212102021 has 4 divisors (see below), whose sum is σ = 20864105344. Its totient is φ = 19560098700.

The previous prime is 20212102013. The next prime is 20212102049. The reversal of 20212102021 is 12020121202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 20212102021 - 2³ = 20212102013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 20212101992 and 20212102010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20212102051) 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 3 ways as a sum of consecutive naturals, for example, 326001615 + ... + 326001676.

It is an arithmetic number, because the mean of its divisors is an integer number (5216026336).

Almost surely, 2^20212102021 is an apocalyptic number.

It is an amenable number.

20212102021 is a deficient number, since it is larger than the sum of its proper divisors (652003323).

20212102021 is an equidigital number, since it uses as much as digits as its factorization.

20212102021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 652003322.

The product of its (nonzero) digits is 32, while the sum is 13.

Adding to 20212102021 its reverse (12020121202), we get a palindrome (32232223223).

The spelling of 20212102021 in words is "twenty billion, two hundred twelve million, one hundred two thousand, twenty-one".