210111211121 has 16 divisors (see below), whose sum is σ = 242664240768. Its totient is φ = 178194816000.

The previous prime is 210111211117. The next prime is 210111211129. The reversal of 210111211121 is 121112111012.

It is a cyclic number.

It is not a de Polignac number, because 210111211121 - 2² = 210111211117 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 210111211096 and 210111211105.

It is not an unprimeable number, because it can be changed into a prime (210111211129) 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, 985361 + ... + 1179473.

It is an arithmetic number, because the mean of its divisors is an integer number (15166515048).

Almost surely, 2^210111211121 is an apocalyptic number.

It is an amenable number.

210111211121 is a deficient number, since it is larger than the sum of its proper divisors (32553029647).

210111211121 is a wasteful number, since it uses less digits than its factorization.

210111211121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195752.

The product of its (nonzero) digits is 8, while the sum is 14.

Adding to 210111211121 its reverse (121112111012), we get a palindrome (331223322133).

The spelling of 210111211121 in words is "two hundred ten billion, one hundred eleven million, two hundred eleven thousand, one hundred twenty-one".