1212200220109 has 2 divisors, whose sum is σ = 1212200220110. Its totient is φ = 1212200220108.

The previous prime is 1212200220097. The next prime is 1212200220167. The reversal of 1212200220109 is 9010220022121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1199469611209 + 12730608900 = 1095203^2 + 112830^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1212200220109 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1212200220109.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1212200226109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606100110054 + 606100110055.

It is an arithmetic number, because the mean of its divisors is an integer number (606100110055).

Almost surely, 2^{1212200220109} is an apocalyptic number.

It is an amenable number.

1212200220109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1212200220109 is an equidigital number, since it uses as much as digits as its factorization.

1212200220109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 288, while the sum is 22.

The spelling of 1212200220109 in words is "one trillion, two hundred twelve billion, two hundred million, two hundred twenty thousand, one hundred nine".