210221120111111 has 8 divisors (see below), whose sum is σ = 210234008887104. Its totient is φ = 210208231789920.

The previous prime is 210221120111099. The next prime is 210221120111129. The reversal of 210221120111111 is 111111021122012.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-210221120111111 is a prime.

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 210221120111111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (210221120113111) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1387733105 + ... + 1387884581.

It is an arithmetic number, because the mean of its divisors is an integer number (26279251110888).

Almost surely, 2^{210221120111111} is an apocalyptic number.

210221120111111 is a deficient number, since it is larger than the sum of its proper divisors (12888775993).

210221120111111 is a wasteful number, since it uses less digits than its factorization.

210221120111111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 227401.

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

Adding to 210221120111111 its reverse (111111021122012), we get a palindrome (321332141233123).

The spelling of 210221120111111 in words is "two hundred ten trillion, two hundred twenty-one billion, one hundred twenty million, one hundred eleven thousand, one hundred eleven".