1021212120109 has 2 divisors, whose sum is σ = 1021212120110. Its totient is φ = 1021212120108.

The previous prime is 1021212120107. The next prime is 1021212120143. The reversal of 1021212120109 is 9010212121201.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 966387302500 + 54824817609 = 983050^2 + 234147^2 .

It is a cyclic number.

It is not a de Polignac number, because 1021212120109 - 2¹ = 1021212120107 is a prime.

Together with 1021212120107, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 1021212120109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1021212120107) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510606060054 + 510606060055.

It is an arithmetic number, because the mean of its divisors is an integer number (510606060055).

Almost surely, 2^{1021212120109} is an apocalyptic number.

It is an amenable number.

1021212120109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1021212120109 is an equidigital number, since it uses as much as digits as its factorization.

1021212120109 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.

The spelling of 1021212120109 in words is "one trillion, twenty-one billion, two hundred twelve million, one hundred twenty thousand, one hundred nine".