202112021202121 has 4 divisors (see below), whose sum is σ = 202122430245652. Its totient is φ = 202101612158592.

The previous prime is 202112021202097. The next prime is 202112021202127. The reversal of 202112021202121 is 121202120211202.

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 7236982346896 + 194875038855225 = 2690164^2 + 13959765^2 .

It is a cyclic number.

It is not a de Polignac number, because 202112021202121 - 2¹⁷ = 202112021071049 is a prime.

It is a super-2 number, since 2×202112021202121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (202112021202127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5204492640 + ... + 5204531473.

It is an arithmetic number, because the mean of its divisors is an integer number (50530607561413).

Almost surely, 2^{202112021202121} is an apocalyptic number.

It is an amenable number.

202112021202121 is a deficient number, since it is larger than the sum of its proper divisors (10409043531).

202112021202121 is a wasteful number, since it uses less digits than its factorization.

202112021202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10409043530.

The product of its (nonzero) digits is 128, while the sum is 19.

Adding to 202112021202121 its reverse (121202120211202), we get a palindrome (323314141413323).

The spelling of 202112021202121 in words is "two hundred two trillion, one hundred twelve billion, twenty-one million, two hundred two thousand, one hundred twenty-one".