211212111204 has 36 divisors (see below), whose sum is σ = 534223573884. Its totient is φ = 70361009472.

The previous prime is 211212111199. The next prime is 211212111217. The reversal of 211212111204 is 402111212112.

It can be written as a sum of positive squares in 2 ways, for example, as 51460015104 + 159752096100 = 226848^2 + 399690^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×211212111204² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1733067 + ... + 1850930.

It is an arithmetic number, because the mean of its divisors is an integer number (14839543719).

Almost surely, 2^211212111204 is an apocalyptic number.

It is an amenable number.

211212111204 is an abundant number, since it is smaller than the sum of its proper divisors (323011462680).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

211212111204 is a wasteful number, since it uses less digits than its factorization.

211212111204 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3585644 (or 3585639 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 18.

Adding to 211212111204 its reverse (402111212112), we get a palindrome (613323323316).

The spelling of 211212111204 in words is "two hundred eleven billion, two hundred twelve million, one hundred eleven thousand, two hundred four".