211112011221 has 32 divisors (see below), whose sum is σ = 290834903040. Its totient is φ = 136113493824.

The previous prime is 211112011153. The next prime is 211112011307. The reversal of 211112011221 is 122110211112.

It is a happy number.

It is not a de Polignac number, because 211112011221 - 2¹³ = 211112003029 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 211112011221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (211112011021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 13508550 + ... + 13524168.

It is an arithmetic number, because the mean of its divisors is an integer number (9088590720).

Almost surely, 2^211112011221 is an apocalyptic number.

It is an amenable number.

211112011221 is a deficient number, since it is larger than the sum of its proper divisors (79722891819).

211112011221 is a wasteful number, since it uses less digits than its factorization.

211112011221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16385.

The product of its (nonzero) digits is 16, while the sum is 15.

Adding to 211112011221 its reverse (122110211112), we get a palindrome (333222222333).

The spelling of 211112011221 in words is "two hundred eleven billion, one hundred twelve million, eleven thousand, two hundred twenty-one".