211121210121 has 32 divisors (see below), whose sum is σ = 302128662528. Its totient is φ = 130669144320.

The previous prime is 211121210119. The next prime is 211121210123. The reversal of 211121210121 is 121012121112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (211121210119) and next prime (211121210123).

It is not a de Polignac number, because 211121210121 - 2¹ = 211121210119 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211121210121.

It is not an unprimeable number, because it can be changed into a prime (211121210123) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1021116 + ... + 1210338.

It is an arithmetic number, because the mean of its divisors is an integer number (9441520704).

Almost surely, 2^211121210121 is an apocalyptic number.

It is an amenable number.

211121210121 is a deficient number, since it is larger than the sum of its proper divisors (91007452407).

211121210121 is a wasteful number, since it uses less digits than its factorization.

211121210121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 189541.

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

Adding to 211121210121 its reverse (121012121112), we get a palindrome (332133331233).

The spelling of 211121210121 in words is "two hundred eleven billion, one hundred twenty-one million, two hundred ten thousand, one hundred twenty-one".