221211110021111 has 4 divisors (see below), whose sum is σ = 252812697166992. Its totient is φ = 189609522875232.

The previous prime is 221211110021087. The next prime is 221211110021131. The reversal of 221211110021111 is 111120011112122.

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 221211110021111 - 2²² = 221211105826807 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 221211110021111.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (221211110021131) 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, 15800793572930 + ... + 15800793572943.

It is an arithmetic number, because the mean of its divisors is an integer number (63203174291748).

Almost surely, 2^{221211110021111} is an apocalyptic number.

221211110021111 is a deficient number, since it is larger than the sum of its proper divisors (31601587145881).

221211110021111 is an equidigital number, since it uses as much as digits as its factorization.

221211110021111 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31601587145880.

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

Adding to 221211110021111 its reverse (111120011112122), we get a palindrome (332331121133233).

The spelling of 221211110021111 in words is "two hundred twenty-one trillion, two hundred eleven billion, one hundred ten million, twenty-one thousand, one hundred eleven".