202111212112021 has 4 divisors (see below), whose sum is σ = 202194832806252. Its totient is φ = 202027591417792.

The previous prime is 202111212111967. The next prime is 202111212112063. The reversal of 202111212112021 is 120211212111202.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 150930709168996 + 51180502943025 = 12285386^2 + 7154055^2 .

It is a cyclic number.

It is not a de Polignac number, because 202111212112021 - 2⁹ = 202111212111509 is a prime.

It is a super-2 number, since 2×202111212112021² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 202111212112021.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (202111212112321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 41810343490 + ... + 41810348323.

It is an arithmetic number, because the mean of its divisors is an integer number (50548708201563).

Almost surely, 2^{202111212112021} is an apocalyptic number.

It is an amenable number.

202111212112021 is a deficient number, since it is larger than the sum of its proper divisors (83620694231).

202111212112021 is an equidigital number, since it uses as much as digits as its factorization.

202111212112021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83620694230.

The product of its (nonzero) digits is 64, while the sum is 19.

Adding to 202111212112021 its reverse (120211212111202), we get a palindrome (322322424223223).

The spelling of 202111212112021 in words is "two hundred two trillion, one hundred eleven billion, two hundred twelve million, one hundred twelve thousand, twenty-one".