210111112221 has 8 divisors (see below), whose sum is σ = 280698540960. Its totient is φ = 139798879152.

The previous prime is 210111112217. The next prime is 210111112271. The reversal of 210111112221 is 122211111012.

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 210111112221 - 2² = 210111112217 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210111112221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111112201) 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, 68797135 + ... + 68800188.

It is an arithmetic number, because the mean of its divisors is an integer number (35087317620).

Almost surely, 2^210111112221 is an apocalyptic number.

It is an amenable number.

210111112221 is a deficient number, since it is larger than the sum of its proper divisors (70587428739).

210111112221 is a wasteful number, since it uses less digits than its factorization.

210111112221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 137597835.

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

Adding to 210111112221 its reverse (122211111012), we get a palindrome (332322223233).

The spelling of 210111112221 in words is "two hundred ten billion, one hundred eleven million, one hundred twelve thousand, two hundred twenty-one".