211111002009 has 96 divisors (see below), whose sum is σ = 327333726720. Its totient is φ = 130908151296.

The previous prime is 211111001999. The next prime is 211111002019. The reversal of 211111002009 is 900200111112.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (211111001999) and next prime (211111002019).

It is not a de Polignac number, because 211111002009 - 2⁸ = 211111001753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211111001982 and 211111002000.

It is not an unprimeable number, because it can be changed into a prime (211111002019) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 254657007 + ... + 254657835.

It is an arithmetic number, because the mean of its divisors is an integer number (3409726320).

Almost surely, 2^211111002009 is an apocalyptic number.

It is an amenable number.

211111002009 is a deficient number, since it is larger than the sum of its proper divisors (116222724711).

211111002009 is a wasteful number, since it uses less digits than its factorization.

211111002009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1279 (or 1276 counting only the distinct ones).

The product of its (nonzero) digits is 36, while the sum is 18.

The spelling of 211111002009 in words is "two hundred eleven billion, one hundred eleven million, two thousand, nine".