12121020001 has 2 divisors, whose sum is σ = 12121020002. Its totient is φ = 12121020000.

The previous prime is 12121019971. The next prime is 12121020011. The reversal of 12121020001 is 10002012121.

It is an a-pointer prime, because the next prime (12121020011) can be obtained adding 12121020001 to its sum of digits (10).

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 7538406976 + 4582613025 = 86824^2 + 67695^2 .

It is a cyclic number.

It is not a de Polignac number, because 12121020001 - 2¹⁷ = 12120888929 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 12121020001.

It is not a weakly prime, because it can be changed into another prime (12121020011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6060510000 + 6060510001.

It is an arithmetic number, because the mean of its divisors is an integer number (6060510001).

Almost surely, 2^12121020001 is an apocalyptic number.

It is an amenable number.

12121020001 is a deficient number, since it is larger than the sum of its proper divisors (1).

12121020001 is an equidigital number, since it uses as much as digits as its factorization.

12121020001 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 12121020001 its reverse (10002012121), we get a palindrome (22123032122).

The spelling of 12121020001 in words is "twelve billion, one hundred twenty-one million, twenty thousand, one".