12211101 has 16 divisors (see below), whose sum is σ = 20675200. Its totient is φ = 6977664.

The previous prime is 12211079. The next prime is 12211103. The reversal of 12211101 is 10111221.

It is a happy number.

It is not a de Polignac number, because 12211101 - 2⁷ = 12210973 is a prime.

It is a super-2 number, since 2×12211101² = 298221975264402, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12211103) 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, 32116 + ... + 32493.

It is an arithmetic number, because the mean of its divisors is an integer number (1292200).

Almost surely, 2^12211101 is an apocalyptic number.

It is an amenable number.

12211101 is a deficient number, since it is larger than the sum of its proper divisors (8464099).

12211101 is an equidigital number, since it uses as much as digits as its factorization.

12211101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64625 (or 64619 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 12211101 is about 3494.4385815178. The cubic root of 12211101 is about 230.2775540240.

Adding to 12211101 its reverse (10111221), we get a palindrome (22322322).

The spelling of 12211101 in words is "twelve million, two hundred eleven thousand, one hundred one".