211211112121 has 8 divisors (see below), whose sum is σ = 213292477440. Its totient is φ = 209136282768.

The previous prime is 211211112059. The next prime is 211211112149. The reversal of 211211112121 is 121211112112.

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

It is not a de Polignac number, because 211211112121 - 2²³ = 211202723513 is a prime.

It is a super-2 number, since 2×211211112121² (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 = 211211112095 and 211211112104.

It is not an unprimeable number, because it can be changed into a prime (211211112221) 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, 1569031 + ... + 1698316.

It is an arithmetic number, because the mean of its divisors is an integer number (26661559680).

Almost surely, 2^211211112121 is an apocalyptic number.

It is an amenable number.

211211112121 is a deficient number, since it is larger than the sum of its proper divisors (2081365319).

211211112121 is a wasteful number, since it uses less digits than its factorization.

211211112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3267983.

The product of its digits is 16, while the sum is 16.

Adding to 211211112121 its reverse (121211112112), we get a palindrome (332422224233).

Subtracting from 211211112121 its reverse (121211112112), we obtain a palindrome (90000000009).

The spelling of 211211112121 in words is "two hundred eleven billion, two hundred eleven million, one hundred twelve thousand, one hundred twenty-one".