221211002011 has 4 divisors (see below), whose sum is σ = 234223413912. Its totient is φ = 208198590112.

The previous prime is 221211001997. The next prime is 221211002021. The reversal of 221211002011 is 110200112122.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 110200112122 = 2 ⋅55100056061.

It is a cyclic number.

It is not a de Polignac number, because 221211002011 - 2⁹ = 221211001499 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 221211001982 and 221211002000.

It is not an unprimeable number, because it can be changed into a prime (221211002021) 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, 6506205925 + ... + 6506205958.

It is an arithmetic number, because the mean of its divisors is an integer number (58555853478).

Almost surely, 2^221211002011 is an apocalyptic number.

221211002011 is a deficient number, since it is larger than the sum of its proper divisors (13012411901).

221211002011 is a wasteful number, since it uses less digits than its factorization.

221211002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13012411900.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 221211002011 its reverse (110200112122), we get a palindrome (331411114133).

The spelling of 221211002011 in words is "two hundred twenty-one billion, two hundred eleven million, two thousand, eleven".