1021212112009 has 2 divisors, whose sum is σ = 1021212112010. Its totient is φ = 1021212112008.

The previous prime is 1021212112003. The next prime is 1021212112027. The reversal of 1021212112009 is 9002112121201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1008728966025 + 12483145984 = 1004355^2 + 111728^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021212112009 - 2³⁷ = 883773158537 is a prime.

It is not a weakly prime, because it can be changed into another prime (1021212112003) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510606056004 + 510606056005.

It is an arithmetic number, because the mean of its divisors is an integer number (510606056005).

Almost surely, 2^{1021212112009} is an apocalyptic number.

It is an amenable number.

1021212112009 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021212112009 is an equidigital number, since it uses as much as digits as its factorization.

1021212112009 is an odious number, because the sum of its binary digits is odd.

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

The spelling of 1021212112009 in words is "one trillion, twenty-one billion, two hundred twelve million, one hundred twelve thousand, nine".