20101211212189 has 2 divisors, whose sum is σ = 20101211212190. Its totient is φ = 20101211212188.

The previous prime is 20101211212163. The next prime is 20101211212237. The reversal of 20101211212189 is 98121211210102.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 19585891104025 + 515320108164 = 4425595^2 + 717858^2 .

It is a cyclic number.

It is not a de Polignac number, because 20101211212189 - 2⁹ = 20101211211677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 20101211212189.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20101211212289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10050605606094 + 10050605606095.

It is an arithmetic number, because the mean of its divisors is an integer number (10050605606095).

Almost surely, 2^{20101211212189} is an apocalyptic number.

It is an amenable number.

20101211212189 is a deficient number, since it is larger than the sum of its proper divisors (1).

20101211212189 is an equidigital number, since it uses as much as digits as its factorization.

20101211212189 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1152, while the sum is 31.

The spelling of 20101211212189 in words is "twenty trillion, one hundred one billion, two hundred eleven million, two hundred twelve thousand, one hundred eighty-nine".