102112012221209 has 4 divisors (see below), whose sum is σ = 102183269732916. Its totient is φ = 102040754709504.

The previous prime is 102112012221199. The next prime is 102112012221217. The reversal of 102112012221209 is 902122210211201.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 61873326721600 + 40238685499609 = 7865960^2 + 6343397^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-102112012221209 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (102112012221269) 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, 35628753704 + ... + 35628756569.

It is an arithmetic number, because the mean of its divisors is an integer number (25545817433229).

Almost surely, 2^{102112012221209} is an apocalyptic number.

It is an amenable number.

102112012221209 is a deficient number, since it is larger than the sum of its proper divisors (71257511707).

102112012221209 is an equidigital number, since it uses as much as digits as its factorization.

102112012221209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71257511706.

The product of its (nonzero) digits is 576, while the sum is 26.

The spelling of 102112012221209 in words is "one hundred two trillion, one hundred twelve billion, twelve million, two hundred twenty-one thousand, two hundred nine".