1020012101209 has 2 divisors, whose sum is σ = 1020012101210. Its totient is φ = 1020012101208.

The previous prime is 1020012101183. The next prime is 1020012101243. The reversal of 1020012101209 is 9021012100201.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 684585795609 + 335426305600 = 827397^2 + 579160^2 .

It is a cyclic number.

It is not a de Polignac number, because 1020012101209 - 2³⁷ = 882573147737 is a prime.

It is a super-2 number, since 2×1020012101209² (a number of 25 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1020012101309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 510006050604 + 510006050605.

It is an arithmetic number, because the mean of its divisors is an integer number (510006050605).

Almost surely, 2^{1020012101209} is an apocalyptic number.

It is an amenable number.

1020012101209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1020012101209 is an equidigital number, since it uses as much as digits as its factorization.

1020012101209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 72, while the sum is 19.

The spelling of 1020012101209 in words is "one trillion, twenty billion, twelve million, one hundred one thousand, two hundred nine".