202112021121 has 4 divisors (see below), whose sum is σ = 269482694832. Its totient is φ = 134741347412.

The previous prime is 202112021119. The next prime is 202112021171. The reversal of 202112021121 is 121120211202.

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 202112021121 - 2¹ = 202112021119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 202112021121.

It is not an unprimeable number, because it can be changed into a prime (202112021101) 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, 33685336851 + ... + 33685336856.

It is an arithmetic number, because the mean of its divisors is an integer number (67370673708).

Almost surely, 2^202112021121 is an apocalyptic number.

It is an amenable number.

202112021121 is a deficient number, since it is larger than the sum of its proper divisors (67370673711).

202112021121 is an equidigital number, since it uses as much as digits as its factorization.

202112021121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67370673710.

The product of its (nonzero) digits is 32, while the sum is 15.

Adding to 202112021121 its reverse (121120211202), we get a palindrome (323232232323).

The spelling of 202112021121 in words is "two hundred two billion, one hundred twelve million, twenty-one thousand, one hundred twenty-one".