1211012101209 has 8 divisors (see below), whose sum is σ = 1699666107040. Its totient is φ = 764849748096.

The previous prime is 1211012101183. The next prime is 1211012101297. The reversal of 1211012101209 is 9021012101121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1211012101209 - 2¹³ = 1211012093017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1211012101109) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10622913112 + ... + 10622913225.

It is an arithmetic number, because the mean of its divisors is an integer number (212458263380).

Almost surely, 2^{1211012101209} is an apocalyptic number.

1211012101209 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1211012101209 is a deficient number, since it is larger than the sum of its proper divisors (488654005831).

1211012101209 is a wasteful number, since it uses less digits than its factorization.

1211012101209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21245826359.

The product of its (nonzero) digits is 72, while the sum is 21.

The spelling of 1211012101209 in words is "one trillion, two hundred eleven billion, twelve million, one hundred one thousand, two hundred nine".