211121120121 has 8 divisors (see below), whose sum is σ = 284396835744. Its totient is φ = 139296408960.

The previous prime is 211121120117. The next prime is 211121120129. The reversal of 211121120121 is 121021121112.

It is a happy number.

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

It is not a de Polignac number, because 211121120121 - 2² = 211121120117 is a prime.

It is a super-2 number, since 2×211121120121² (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 211121120121.

It is not an unprimeable number, because it can be changed into a prime (211121120129) 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, 362750775 + ... + 362751356.

It is an arithmetic number, because the mean of its divisors is an integer number (35549604468).

Almost surely, 2^211121120121 is an apocalyptic number.

It is an amenable number.

211121120121 is a deficient number, since it is larger than the sum of its proper divisors (73275715623).

211121120121 is an equidigital number, since it uses as much as digits as its factorization.

211121120121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 725502231.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211121120121 its reverse (121021121112), we get a palindrome (332142241233).

Subtracting from 211121120121 its reverse (121021121112), we obtain a palindrome (90099999009).

The spelling of 211121120121 in words is "two hundred eleven billion, one hundred twenty-one million, one hundred twenty thousand, one hundred twenty-one".