211201022009 has 4 divisors (see below), whose sum is σ = 213070057716. Its totient is φ = 209331986304.

The previous prime is 211201022003. The next prime is 211201022017. The reversal of 211201022009 is 900220102112.

It is a happy number.

211201022009 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 can be written as a sum of positive squares in 2 ways, for example, as 48663036409 + 162537985600 = 220597^2 + 403160^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-211201022009 is a prime.

It is a super-2 number, since 2×211201022009² (a number of 23 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (211201022003) 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, 934517684 + ... + 934517909.

It is an arithmetic number, because the mean of its divisors is an integer number (53267514429).

Almost surely, 2^211201022009 is an apocalyptic number.

It is an amenable number.

211201022009 is a deficient number, since it is larger than the sum of its proper divisors (1869035707).

211201022009 is a wasteful number, since it uses less digits than its factorization.

211201022009 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1869035706.

The product of its (nonzero) digits is 144, while the sum is 20.

The spelling of 211201022009 in words is "two hundred eleven billion, two hundred one million, twenty-two thousand, nine".