100211121209 has 2 divisors, whose sum is σ = 100211121210. Its totient is φ = 100211121208.

The previous prime is 100211121173. The next prime is 100211121223. The reversal of 100211121209 is 902121112001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64124419984 + 36086701225 = 253228^2 + 189965^2 .

It is a cyclic number.

It is not a de Polignac number, because 100211121209 - 2¹⁶ = 100211055673 is a prime.

It is not a weakly prime, because it can be changed into another prime (100211121239) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50105560604 + 50105560605.

It is an arithmetic number, because the mean of its divisors is an integer number (50105560605).

Almost surely, 2^100211121209 is an apocalyptic number.

It is an amenable number.

100211121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

100211121209 is an equidigital number, since it uses as much as digits as its factorization.

100211121209 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 100211121209 in words is "one hundred billion, two hundred eleven million, one hundred twenty-one thousand, two hundred nine".