211211102122121 has 8 divisors (see below), whose sum is σ = 211815827138304. Its totient is φ = 210606413226880.

The previous prime is 211211102122091. The next prime is 211211102122147. The reversal of 211211102122121 is 121221201112112.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 211211102122121 - 2¹⁸ = 211211101859977 is a prime.

It is a super-2 number, since 2×211211102122121² (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 = 211211102122093 and 211211102122102.

It is not an unprimeable number, because it can be changed into a prime (211211002122121) 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, 2702960 + ... + 20729886.

It is an arithmetic number, because the mean of its divisors is an integer number (26476978392288).

Almost surely, 2^{211211102122121} is an apocalyptic number.

It is an amenable number.

211211102122121 is a deficient number, since it is larger than the sum of its proper divisors (604725016183).

211211102122121 is a wasteful number, since it uses less digits than its factorization.

211211102122121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18060471.

The product of its (nonzero) digits is 64, while the sum is 20.

Adding to 211211102122121 its reverse (121221201112112), we get a palindrome (332432303234233).

The spelling of 211211102122121 in words is "two hundred eleven trillion, two hundred eleven billion, one hundred two million, one hundred twenty-two thousand, one hundred twenty-one".