211212021211 has 24 divisors (see below), whose sum is σ = 236419180704. Its totient is φ = 188257703040.

The previous prime is 211212021199. The next prime is 211212021269. The reversal of 211212021211 is 112120212112.

It is not a de Polignac number, because 211212021211 - 2⁹ = 211212020699 is a prime.

It is a super-2 number, since 2×211212021211² (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 (211212027211) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 297975 + ... + 714991.

It is an arithmetic number, because the mean of its divisors is an integer number (9850799196).

Almost surely, 2^211212021211 is an apocalyptic number.

211212021211 is a deficient number, since it is larger than the sum of its proper divisors (25207159493).

211212021211 is a wasteful number, since it uses less digits than its factorization.

211212021211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 417139 (or 417120 counting only the distinct ones).

The product of its (nonzero) digits is 32, while the sum is 16.

Adding to 211212021211 its reverse (112120212112), we get a palindrome (323332233323).

It can be divided in two parts, 2 and 11212021211, that multiplied together give a palindrome (22424042422).

The spelling of 211212021211 in words is "two hundred eleven billion, two hundred twelve million, twenty-one thousand, two hundred eleven".