102211209 has 6 divisors (see below), whose sum is σ = 147638426. Its totient is φ = 68140800.

The previous prime is 102211199. The next prime is 102211217. The reversal of 102211209 is 902112201.

It can be written as a sum of positive squares in only one way, i.e., 73051209 + 29160000 = 8547^2 + 5400^2 .

It is not a de Polignac number, because 102211209 - 2⁹ = 102210697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 102211191 and 102211200.

It is not an unprimeable number, because it can be changed into a prime (102211409) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5678392 + ... + 5678409.

Almost surely, 2^102211209 is an apocalyptic number.

It is an amenable number.

102211209 is a deficient number, since it is larger than the sum of its proper divisors (45427217).

102211209 is a wasteful number, since it uses less digits than its factorization.

102211209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11356807 (or 11356804 counting only the distinct ones).

The product of its (nonzero) digits is 72, while the sum is 18.

The square root of 102211209 is about 10109.9559346221. The cubic root of 102211209 is about 467.5551465349. Note that the first 3 decimals are identical.

The spelling of 102211209 in words is "one hundred two million, two hundred eleven thousand, two hundred nine".