211121001009 has 12 divisors (see below), whose sum is σ = 310121245200. Its totient is φ = 138361785624.

The previous prime is 211121000983. The next prime is 211121001017. The reversal of 211121001009 is 900100121112.

It is a happy number.

It is not a de Polignac number, because 211121001009 - 2¹⁵ = 211120968241 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 211121000982 and 211121001000.

It is not an unprimeable number, because it can be changed into a prime (211121001079) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 198795139 + ... + 198796200.

It is an arithmetic number, because the mean of its divisors is an integer number (25843437100).

Almost surely, 2^211121001009 is an apocalyptic number.

It is an amenable number.

211121001009 is a deficient number, since it is larger than the sum of its proper divisors (99000244191).

211121001009 is a wasteful number, since it uses less digits than its factorization.

211121001009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397591404 (or 397591401 counting only the distinct ones).

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

It can be divided in two parts, 21112 and 1001009, that added together give a square (1022121 = 1011²).

The spelling of 211121001009 in words is "two hundred eleven billion, one hundred twenty-one million, one thousand, nine".