211021112121 has 16 divisors (see below), whose sum is σ = 286160521920. Its totient is φ = 138281725440.

The previous prime is 211021112111. The next prime is 211021112143. The reversal of 211021112121 is 121211120112.

It is a happy number.

It is not a de Polignac number, because 211021112121 - 2²⁵ = 210987557689 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211021112121.

It is not an unprimeable number, because it can be changed into a prime (211021112111) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1769061 + ... + 1884573.

It is an arithmetic number, because the mean of its divisors is an integer number (17885032620).

Almost surely, 2^211021112121 is an apocalyptic number.

It is an amenable number.

211021112121 is a deficient number, since it is larger than the sum of its proper divisors (75139409799).

211021112121 is a wasteful number, since it uses less digits than its factorization.

211021112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125896.

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

Adding to 211021112121 its reverse (121211120112), we get a palindrome (332232232233).

The spelling of 211021112121 in words is "two hundred eleven billion, twenty-one million, one hundred twelve thousand, one hundred twenty-one".