1210021212109 has 2 divisors, whose sum is σ = 1210021212110. Its totient is φ = 1210021212108.

The previous prime is 1210021212007. The next prime is 1210021212119. The reversal of 1210021212109 is 9012121200121.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 795658648009 + 414362564100 = 891997^2 + 643710^2 .

It is a cyclic number.

It is not a de Polignac number, because 1210021212109 - 2²⁵ = 1209987657677 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1210021212109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1210021212119) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 605010606054 + 605010606055.

It is an arithmetic number, because the mean of its divisors is an integer number (605010606055).

Almost surely, 2^{1210021212109} is an apocalyptic number.

It is an amenable number.

1210021212109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1210021212109 is an equidigital number, since it uses as much as digits as its factorization.

1210021212109 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 1210021212109 in words is "one trillion, two hundred ten billion, twenty-one million, two hundred twelve thousand, one hundred nine".