221012101111 has 4 divisors (see below), whose sum is σ = 221311171000. Its totient is φ = 220713031224.

The previous prime is 221012101109. The next prime is 221012101129. The reversal of 221012101111 is 111101210122.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 221012101111 - 2¹ = 221012101109 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221012101091 and 221012101100.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221012101151) 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 3 ways as a sum of consecutive naturals, for example, 149533836 + ... + 149535313.

It is an arithmetic number, because the mean of its divisors is an integer number (55327792750).

Almost surely, 2^221012101111 is an apocalyptic number.

221012101111 is a deficient number, since it is larger than the sum of its proper divisors (299069889).

221012101111 is an equidigital number, since it uses as much as digits as its factorization.

221012101111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299069888.

The product of its (nonzero) digits is 8, while the sum is 13.

Adding to 221012101111 its reverse (111101210122), we get a palindrome (332113311233).

It can be divided in two parts, 22101 and 2101111, that added together give a palindrome (2123212).

The spelling of 221012101111 in words is "two hundred twenty-one billion, twelve million, one hundred one thousand, one hundred eleven".