12212121001 has 2 divisors, whose sum is σ = 12212121002. Its totient is φ = 12212121000.

The previous prime is 12212120939. The next prime is 12212121011. The reversal of 12212121001 is 10012121221.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11529605376 + 682515625 = 107376^2 + 26125^2 .

It is a cyclic number.

It is not a de Polignac number, because 12212121001 - 2¹⁵ = 12212088233 is a prime.

It is not a weakly prime, because it can be changed into another prime (12212121011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6106060500 + 6106060501.

It is an arithmetic number, because the mean of its divisors is an integer number (6106060501).

Almost surely, 2^12212121001 is an apocalyptic number.

It is an amenable number.

12212121001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12212121001 is an equidigital number, since it uses as much as digits as its factorization.

12212121001 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16, while the sum is 13.

Adding to 12212121001 its reverse (10012121221), we get a palindrome (22224242222).

The spelling of 12212121001 in words is "twelve billion, two hundred twelve million, one hundred twenty-one thousand, one".