221121001111 has 2 divisors, whose sum is σ = 221121001112. Its totient is φ = 221121001110.

The previous prime is 221121001099. The next prime is 221121001163. The reversal of 221121001111 is 111100121122.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 221121001111 - 2⁹ = 221121000599 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 221121001091 and 221121001100.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (221121001181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110560500555 + 110560500556.

It is an arithmetic number, because the mean of its divisors is an integer number (110560500556).

Almost surely, 2^221121001111 is an apocalyptic number.

221121001111 is a deficient number, since it is larger than the sum of its proper divisors (1).

221121001111 is an equidigital number, since it uses as much as digits as its factorization.

221121001111 is an odious number, because the sum of its binary digits is odd.

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

Adding to 221121001111 its reverse (111100121122), we get a palindrome (332221122233).

The spelling of 221121001111 in words is "two hundred twenty-one billion, one hundred twenty-one million, one thousand, one hundred eleven".