210111121221 has 8 divisors (see below), whose sum is σ = 280150700640. Its totient is φ = 140072811312.

The previous prime is 210111121219. The next prime is 210111121301. The reversal of 210111121221 is 122121111012.

It is a happy number.

210111121221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 210111121221 - 2¹ = 210111121219 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 210111121221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210111121921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 180286 + ... + 672848.

It is an arithmetic number, because the mean of its divisors is an integer number (35018837580).

Almost surely, 2^210111121221 is an apocalyptic number.

It is an amenable number.

210111121221 is a deficient number, since it is larger than the sum of its proper divisors (70039579419).

210111121221 is a wasteful number, since it uses less digits than its factorization.

210111121221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634755.

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

Adding to 210111121221 its reverse (122121111012), we get a palindrome (332232232233).

The spelling of 210111121221 in words is "two hundred ten billion, one hundred eleven million, one hundred twenty-one thousand, two hundred twenty-one".