211211022202121 has 4 divisors (see below), whose sum is σ = 211211106586644. Its totient is φ = 211210937817600.

The previous prime is 211211022202109. The next prime is 211211022202123. The reversal of 211211022202121 is 121202220112112.

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 111274312184896 + 99936710017225 = 10548664^2 + 9996835^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211022202121 - 2¹⁰ = 211211022201097 is a prime.

It is a super-2 number, since 2×211211022202121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211211022202093 and 211211022202102.

It is not an unprimeable number, because it can be changed into a prime (211211022202123) 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, 38319320 + ... + 43483241.

It is an arithmetic number, because the mean of its divisors is an integer number (52802776646661).

Almost surely, 2^{211211022202121} is an apocalyptic number.

It is an amenable number.

211211022202121 is a deficient number, since it is larger than the sum of its proper divisors (84384523).

211211022202121 is an equidigital number, since it uses as much as digits as its factorization.

211211022202121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84384522.

The product of its (nonzero) digits is 128, while the sum is 20.

Adding to 211211022202121 its reverse (121202220112112), we get a palindrome (332413242314233).

The spelling of 211211022202121 in words is "two hundred eleven trillion, two hundred eleven billion, twenty-two million, two hundred two thousand, one hundred twenty-one".