12221212001 has 2 divisors, whose sum is σ = 12221212002. Its totient is φ = 12221212000.

The previous prime is 12221211997. The next prime is 12221212013. The reversal of 12221212001 is 10021212221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7195110976 + 5026101025 = 84824^2 + 70895^2 .

It is a cyclic number.

It is not a de Polignac number, because 12221212001 - 2² = 12221211997 is a prime.

It is not a weakly prime, because it can be changed into another prime (12221212301) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6110606000 + 6110606001.

It is an arithmetic number, because the mean of its divisors is an integer number (6110606001).

Almost surely, 2^12221212001 is an apocalyptic number.

It is an amenable number.

12221212001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12221212001 is an equidigital number, since it uses as much as digits as its factorization.

12221212001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 32, while the sum is 14.

Adding to 12221212001 its reverse (10021212221), we get a palindrome (22242424222).

The spelling of 12221212001 in words is "twelve billion, two hundred twenty-one million, two hundred twelve thousand, one".