1212122110009 has 2 divisors, whose sum is σ = 1212122110010. Its totient is φ = 1212122110008.

The previous prime is 1212122110007. The next prime is 1212122110103. The reversal of 1212122110009 is 9000112212121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 986501859984 + 225620250025 = 993228^2 + 474995^2 .

It is a cyclic number.

It is not a de Polignac number, because 1212122110009 - 2¹ = 1212122110007 is a prime.

Together with 1212122110007, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (1212122110007) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606061055004 + 606061055005.

It is an arithmetic number, because the mean of its divisors is an integer number (606061055005).

Almost surely, 2^{1212122110009} is an apocalyptic number.

It is an amenable number.

1212122110009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212122110009 is an equidigital number, since it uses as much as digits as its factorization.

1212122110009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 144, while the sum is 22.

It can be divided in two parts, 1212 and 122110009, that added together give a palindrome (122111221).

The spelling of 1212122110009 in words is "one trillion, two hundred twelve billion, one hundred twenty-two million, one hundred ten thousand, nine".