211210110112121 has 4 divisors (see below), whose sum is σ = 211210183156644. Its totient is φ = 211210037067600.

The previous prime is 211210110112081. The next prime is 211210110112129. The reversal of 211210110112121 is 121211011012112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 172075076472121 + 39135033640000 = 13117739^2 + 6255800^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211210110112121 is a prime.

It is a super-2 number, since 2×211210110112121² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 211210110112121.

It is not an unprimeable number, because it can be changed into a prime (211210110112129) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31998170 + ... + 38030291.

It is an arithmetic number, because the mean of its divisors is an integer number (52802545789161).

Almost surely, 2^{211210110112121} is an apocalyptic number.

It is an amenable number.

211210110112121 is a deficient number, since it is larger than the sum of its proper divisors (73044523).

211210110112121 is an equidigital number, since it uses as much as digits as its factorization.

211210110112121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73044522.

The product of its (nonzero) digits is 16, while the sum is 17.

Adding to 211210110112121 its reverse (121211011012112), we get a palindrome (332421121124233).

The spelling of 211210110112121 in words is "two hundred eleven trillion, two hundred ten billion, one hundred ten million, one hundred twelve thousand, one hundred twenty-one".