210111121010121 has 8 divisors (see below), whose sum is σ = 282627348615840. Its totient is φ = 138834487038912.

The previous prime is 210111121010117. The next prime is 210111121010149. The reversal of 210111121010121 is 121010121111012.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 210111121010121 - 2² = 210111121010117 is a prime.

It is a super-2 number, since 2×210111121010121² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 210111121010121.

It is not an unprimeable number, because it can be changed into a prime (210111121010111) 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, 309898408231 + ... + 309898408908.

It is an arithmetic number, because the mean of its divisors is an integer number (35328418576980).

Almost surely, 2^{210111121010121} is an apocalyptic number.

It is an amenable number.

210111121010121 is a deficient number, since it is larger than the sum of its proper divisors (72516227605719).

210111121010121 is a wasteful number, since it uses less digits than its factorization.

210111121010121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 619796817255.

The product of its (nonzero) digits is 8, while the sum is 15.

Adding to 210111121010121 its reverse (121010121111012), we get a palindrome (331121242121133).

The spelling of 210111121010121 in words is "two hundred ten trillion, one hundred eleven billion, one hundred twenty-one million, ten thousand, one hundred twenty-one".