211220010209 has 16 divisors (see below), whose sum is σ = 229674614400. Its totient is φ = 193081968000.

The previous prime is 211220010193. The next prime is 211220010229. The reversal of 211220010209 is 902010022112.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 211220010209 - 2⁴ = 211220010193 is a prime.

It is a super-2 number, since 2×211220010209² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (211220010229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4149092 + ... + 4199690.

It is an arithmetic number, because the mean of its divisors is an integer number (14354663400).

Almost surely, 2^211220010209 is an apocalyptic number.

It is an amenable number.

211220010209 is a deficient number, since it is larger than the sum of its proper divisors (18454604191).

211220010209 is a wasteful number, since it uses less digits than its factorization.

211220010209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53720.

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

The spelling of 211220010209 in words is "two hundred eleven billion, two hundred twenty million, ten thousand, two hundred nine".