12212001 has 12 divisors (see below), whose sum is σ = 18677412. Its totient is φ = 7662336.

The previous prime is 12211981. The next prime is 12212021. The reversal of 12212001 is 10021221.

12212001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12211981) and next prime (12212021).

It can be written as a sum of positive squares in 2 ways, for example, as 4511376 + 7700625 = 2124^2 + 2775^2 .

It is not a de Polignac number, because 12212001 - 2⁶ = 12211937 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (12212021) 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, 39756 + ... + 40061.

It is an arithmetic number, because the mean of its divisors is an integer number (1556451).

Almost surely, 2^12212001 is an apocalyptic number.

It is an amenable number.

12212001 is a deficient number, since it is larger than the sum of its proper divisors (6465411).

12212001 is a wasteful number, since it uses less digits than its factorization.

12212001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79840 (or 79837 counting only the distinct ones).

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

The square root of 12212001 is about 3494.5673551958. The cubic root of 12212001 is about 230.2832113001.

Adding to 12212001 its reverse (10021221), we get a palindrome (22233222).

The spelling of 12212001 in words is "twelve million, two hundred twelve thousand, one".