221112121011 has 8 divisors (see below), whose sum is σ = 301088845824. Its totient is φ = 144271738440.

The previous prime is 221112120973. The next prime is 221112121019. The reversal of 221112121011 is 110121211122.

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 221112121011 - 2⁹ = 221112120499 is a prime.

It is not an unprimeable number, because it can be changed into a prime (221112121019) 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, 784085395 + ... + 784085676.

It is an arithmetic number, because the mean of its divisors is an integer number (37636105728).

Almost surely, 2^221112121011 is an apocalyptic number.

221112121011 is a deficient number, since it is larger than the sum of its proper divisors (79976724813).

221112121011 is a wasteful number, since it uses less digits than its factorization.

221112121011 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1568171121.

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

Adding to 221112121011 its reverse (110121211122), we get a palindrome (331233332133).

The spelling of 221112121011 in words is "two hundred twenty-one billion, one hundred twelve million, one hundred twenty-one thousand, eleven".