101211221009 has 2 divisors, whose sum is σ = 101211221010. Its totient is φ = 101211221008.

The previous prime is 101211220991. The next prime is 101211221021. The reversal of 101211221009 is 900122112101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50798398225 + 50412822784 = 225385^2 + 224528^2 .

It is an emirp because it is prime and its reverse (900122112101) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 101211221009 - 2²⁰ = 101210172433 is a prime.

It is a super-2 number, since 2×101211221009² (a number of 23 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (101211227009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50605610504 + 50605610505.

It is an arithmetic number, because the mean of its divisors is an integer number (50605610505).

Almost surely, 2^101211221009 is an apocalyptic number.

It is an amenable number.

101211221009 is a deficient number, since it is larger than the sum of its proper divisors (1).

101211221009 is an equidigital number, since it uses as much as digits as its factorization.

101211221009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 20.

The spelling of 101211221009 in words is "one hundred one billion, two hundred eleven million, two hundred twenty-one thousand, nine".