12201010021 has 2 divisors, whose sum is σ = 12201010022. Its totient is φ = 12201010020.

The previous prime is 12201010001. The next prime is 12201010057. The reversal of 12201010021 is 12001010221.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11698801921 + 502208100 = 108161^2 + 22410^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12201010021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12201010001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6100505010 + 6100505011.

It is an arithmetic number, because the mean of its divisors is an integer number (6100505011).

Almost surely, 2^12201010021 is an apocalyptic number.

It is an amenable number.

12201010021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12201010021 is an equidigital number, since it uses as much as digits as its factorization.

12201010021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 8, while the sum is 10.

Adding to 12201010021 its reverse (12001010221), we get a palindrome (24202020242).

The spelling of 12201010021 in words is "twelve billion, two hundred one million, ten thousand, twenty-one".