102011111209 has 4 divisors (see below), whose sum is σ = 116584127104. Its totient is φ = 87438095316.

The previous prime is 102011111171. The next prime is 102011111219. The reversal of 102011111209 is 902111110201.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 902111110201 = 7 ⋅128873015743.

It is a cyclic number.

It is not a de Polignac number, because 102011111209 - 2¹³ = 102011103017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (102011111219) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7286507937 + ... + 7286507950.

It is an arithmetic number, because the mean of its divisors is an integer number (29146031776).

Almost surely, 2^102011111209 is an apocalyptic number.

It is an amenable number.

102011111209 is a deficient number, since it is larger than the sum of its proper divisors (14573015895).

102011111209 is an equidigital number, since it uses as much as digits as its factorization.

102011111209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14573015894.

The product of its (nonzero) digits is 36, while the sum is 19.

The spelling of 102011111209 in words is "one hundred two billion, eleven million, one hundred eleven thousand, two hundred nine".