211211101121 has 4 divisors (see below), whose sum is σ = 213302300244. Its totient is φ = 209119902000.

The previous prime is 211211101109. The next prime is 211211101133. The reversal of 211211101121 is 121101112112.

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

It is an interprime number because it is at equal distance from previous prime (211211101109) and next prime (211211101133).

It can be written as a sum of positive squares in 2 ways, for example, as 198987366400 + 12223734721 = 446080^2 + 110561^2 .

It is a cyclic number.

It is not a de Polignac number, because 211211101121 - 2¹⁰ = 211211100097 is a prime.

It is a super-2 number, since 2×211211101121² (a number of 23 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 = 211211101096 and 211211101105.

It is not an unprimeable number, because it can be changed into a prime (211211101721) 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, 1045599410 + ... + 1045599611.

It is an arithmetic number, because the mean of its divisors is an integer number (53325575061).

Almost surely, 2^211211101121 is an apocalyptic number.

It is an amenable number.

211211101121 is a deficient number, since it is larger than the sum of its proper divisors (2091199123).

211211101121 is a wasteful number, since it uses less digits than its factorization.

211211101121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2091199122.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 211211101121 its reverse (121101112112), we get a palindrome (332312213233).

The spelling of 211211101121 in words is "two hundred eleven billion, two hundred eleven million, one hundred one thousand, one hundred twenty-one".