211211111121 has 8 divisors (see below), whose sum is σ = 281765337984. Its totient is φ = 140732145840.

The previous prime is 211211111113. The next prime is 211211111129. The reversal of 211211111121 is 121111112112.

It is an interprime number because it is at equal distance from previous prime (211211111113) and next prime (211211111129).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 211211111121 - 2³ = 211211111113 is a prime.

It is a super-2 number, since 2×211211111121² (a number of 23 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 211211111121.

It is not an unprimeable number, because it can be changed into a prime (211211111129) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 18808846 + ... + 18820071.

It is an arithmetic number, because the mean of its divisors is an integer number (35220667248).

Almost surely, 2^211211111121 is an apocalyptic number.

It is an amenable number.

211211111121 is a deficient number, since it is larger than the sum of its proper divisors (70554226863).

211211111121 is a wasteful number, since it uses less digits than its factorization.

211211111121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37630791.

The product of its digits is 8, while the sum is 15.

Adding to 211211111121 its reverse (121111112112), we get a palindrome (332322223233).

Subtracting from 211211111121 its reverse (121111112112), we obtain a palindrome (90099999009).

The spelling of 211211111121 in words is "two hundred eleven billion, two hundred eleven million, one hundred eleven thousand, one hundred twenty-one".