101210121209 has 2 divisors, whose sum is σ = 101210121210. Its totient is φ = 101210121208.

The previous prime is 101210121161. The next prime is 101210121211. The reversal of 101210121209 is 902121012101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77689297984 + 23520823225 = 278728^2 + 153365^2 .

It is a cyclic number.

It is not a de Polignac number, because 101210121209 - 2²⁰ = 101209072633 is a prime.

Together with 101210121211, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (101210121239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50605060604 + 50605060605.

It is an arithmetic number, because the mean of its divisors is an integer number (50605060605).

Almost surely, 2^101210121209 is an apocalyptic number.

It is an amenable number.

101210121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

101210121209 is an equidigital number, since it uses as much as digits as its factorization.

101210121209 is an evil number, because the sum of its binary digits is even.

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

The spelling of 101210121209 in words is "one hundred one billion, two hundred ten million, one hundred twenty-one thousand, two hundred nine".