12101021 has 2 divisors, whose sum is σ = 12101022. Its totient is φ = 12101020.

The previous prime is 12101009. The next prime is 12101053. The reversal of 12101021 is 12010121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 11978521 + 122500 = 3461^2 + 350^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-12101021 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (12101821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6050510 + 6050511.

It is an arithmetic number, because the mean of its divisors is an integer number (6050511).

Almost surely, 2^12101021 is an apocalyptic number.

It is an amenable number.

12101021 is a deficient number, since it is larger than the sum of its proper divisors (1).

12101021 is an equidigital number, since it uses as much as digits as its factorization.

12101021 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4, while the sum is 8.

The square root of 12101021 is about 3478.6521815209. The cubic root of 12101021 is about 229.5834995345.

Adding to 12101021 its reverse (12010121), we get a palindrome (24111142).

The spelling of 12101021 in words is "twelve million, one hundred one thousand, twenty-one".