211221002011 has 4 divisors (see below), whose sum is σ = 211329378000. Its totient is φ = 211112626024.

The previous prime is 211221001993. The next prime is 211221002039. The reversal of 211221002011 is 110200122112.

211221002011 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 211221002011 - 2²¹ = 211218904859 is a prime.

It is a super-2 number, since 2×211221002011² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 211221001982 and 211221002000.

It is not an unprimeable number, because it can be changed into a prime (211221002051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 54185071 + ... + 54188968.

It is an arithmetic number, because the mean of its divisors is an integer number (52832344500).

Almost surely, 2^211221002011 is an apocalyptic number.

211221002011 is a deficient number, since it is larger than the sum of its proper divisors (108375989).

211221002011 is a wasteful number, since it uses less digits than its factorization.

211221002011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 108375988.

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

Adding to 211221002011 its reverse (110200122112), we get a palindrome (321421124123).

The spelling of 211221002011 in words is "two hundred eleven billion, two hundred twenty-one million, two thousand, eleven".