1212138147211 has 4 divisors (see below), whose sum is σ = 1212460442424. Its totient is φ = 1211815852000.

The previous prime is 1212138147203. The next prime is 1212138147217. The reversal of 1212138147211 is 1127418312121.

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

It is a cyclic number.

It is not a de Polignac number, because 1212138147211 - 2³ = 1212138147203 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1212138147217) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 161141965 + ... + 161149486.

It is an arithmetic number, because the mean of its divisors is an integer number (303115110606).

Almost surely, 2^{1212138147211} is an apocalyptic number.

1212138147211 is a deficient number, since it is larger than the sum of its proper divisors (322295213).

1212138147211 is an equidigital number, since it uses as much as digits as its factorization.

1212138147211 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 322295212.

The product of its digits is 5376, while the sum is 34.

The spelling of 1212138147211 in words is "one trillion, two hundred twelve billion, one hundred thirty-eight million, one hundred forty-seven thousand, two hundred eleven".