221100021212011 has 4 divisors (see below), whose sum is σ = 223289130333024. Its totient is φ = 218910912091000.

The previous prime is 221100021212009. The next prime is 221100021212107. The reversal of 221100021212011 is 110212120001122.

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 221100021212011 - 2¹ = 221100021212009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (221100021212311) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094554560355 + ... + 1094554560556.

It is an arithmetic number, because the mean of its divisors is an integer number (55822282583256).

Almost surely, 2^{221100021212011} is an apocalyptic number.

221100021212011 is a deficient number, since it is larger than the sum of its proper divisors (2189109121013).

221100021212011 is a wasteful number, since it uses less digits than its factorization.

221100021212011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2189109121012.

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 221100021212011 its reverse (110212120001122), we get a palindrome (331312141213133).

The spelling of 221100021212011 in words is "two hundred twenty-one trillion, one hundred billion, twenty-one million, two hundred twelve thousand, eleven".