221212021110111 has 32 divisors (see below), whose sum is σ = 331896784032000. Its totient is φ = 145605370366944.

The previous prime is 221212021110007. The next prime is 221212021110137. The reversal of 221212021110111 is 111011120212122.

It is a happy number.

221212021110111 is a `hidden beast` number, since 2 + 212 + 120 + 211 + 10 + 111 = 666.

It is not a de Polignac number, because 221212021110111 - 2³⁷ = 221074582156639 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221212021110151) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 131968341 + ... + 133634078.

It is an arithmetic number, because the mean of its divisors is an integer number (10371774501000).

Almost surely, 2^{221212021110111} is an apocalyptic number.

221212021110111 is a deficient number, since it is larger than the sum of its proper divisors (110684762921889).

221212021110111 is a wasteful number, since it uses less digits than its factorization.

221212021110111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 265602820 (or 265602814 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 18.

Adding to 221212021110111 its reverse (111011120212122), we get a palindrome (332223141322233).

The spelling of 221212021110111 in words is "two hundred twenty-one trillion, two hundred twelve billion, twenty-one million, one hundred ten thousand, one hundred eleven".