1211166111021 has 8 divisors (see below), whose sum is σ = 1633032959040. Its totient is φ = 798371668512.

The previous prime is 1211166111007. The next prime is 1211166111031. The reversal of 1211166111021 is 1201116611121.

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

It is not a de Polignac number, because 1211166111021 - 2¹⁰ = 1211166109997 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1211166110982 and 1211166111000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1211166111031) 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, 2268101065 + ... + 2268101598.

It is an arithmetic number, because the mean of its divisors is an integer number (204129119880).

Almost surely, 2^{1211166111021} is an apocalyptic number.

It is an amenable number.

1211166111021 is a deficient number, since it is larger than the sum of its proper divisors (421866848019).

1211166111021 is an equidigital number, since it uses as much as digits as its factorization.

1211166111021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4536202755.

The product of its (nonzero) digits is 144, while the sum is 24.

The spelling of 1211166111021 in words is "one trillion, two hundred eleven billion, one hundred sixty-six million, one hundred eleven thousand, twenty-one".