12220101 has 12 divisors (see below), whose sum is σ = 18128812. Its totient is φ = 7926336.

The previous prime is 12220081. The next prime is 12220111. The reversal of 12220101 is 10102221.

It can be written as a sum of positive squares in 2 ways, for example, as 7049025 + 5171076 = 2655^2 + 2274^2 .

It is not a de Polignac number, because 12220101 - 2⁶ = 12220037 is a prime.

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

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12220111) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18016 + ... + 18681.

Almost surely, 2^12220101 is an apocalyptic number.

It is an amenable number.

12220101 is a deficient number, since it is larger than the sum of its proper divisors (5908711).

12220101 is a wasteful number, since it uses less digits than its factorization.

12220101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36740 (or 36737 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 12220101 is about 3495.7261048314. The cubic root of 12220101 is about 230.3341142809.

Adding to 12220101 its reverse (10102221), we get a palindrome (22322322).

It can be divided in two parts, 12220 and 101, that added together give a palindrome (12321).

The spelling of 12220101 in words is "twelve million, two hundred twenty thousand, one hundred one".