211100021205 has 16 divisors (see below), whose sum is σ = 345998084544. Its totient is φ = 109840661120.

The previous prime is 211100021203. The next prime is 211100021213. The reversal of 211100021205 is 502120001112.

It is not a de Polignac number, because 211100021205 - 2¹ = 211100021203 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211100021201) 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, 171625419 + ... + 171626648.

It is an arithmetic number, because the mean of its divisors is an integer number (21624880284).

Almost surely, 2^211100021205 is an apocalyptic number.

It is an amenable number.

211100021205 is a deficient number, since it is larger than the sum of its proper divisors (134898063339).

211100021205 is a wasteful number, since it uses less digits than its factorization.

211100021205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 343252116.

The product of its (nonzero) digits is 40, while the sum is 15.

Adding to 211100021205 its reverse (502120001112), we get a palindrome (713220022317).

The spelling of 211100021205 in words is "two hundred eleven billion, one hundred million, twenty-one thousand, two hundred five".