2021166123 has 4 divisors (see below), whose sum is σ = 2694888168. Its totient is φ = 1347444080.

The previous prime is 2021166113. The next prime is 2021166151. The reversal of 2021166123 is 3216611202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021166123 - 2⁹ = 2021165611 is a prime.

It is a super-2 number, since 2×2021166123² = 8170224993525702258, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 2021166093 and 2021166102.

It is not an unprimeable number, because it can be changed into a prime (2021166113) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336861018 + ... + 336861023.

It is an arithmetic number, because the mean of its divisors is an integer number (673722042).

Almost surely, 2^2021166123 is an apocalyptic number.

2021166123 is a deficient number, since it is larger than the sum of its proper divisors (673722045).

2021166123 is an equidigital number, since it uses as much as digits as its factorization.

2021166123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673722044.

The product of its (nonzero) digits is 864, while the sum is 24.

The square root of 2021166123 is about 44957.3811848511. The cubic root of 2021166123 is about 1264.3500695694.

Adding to 2021166123 its reverse (3216611202), we get a palindrome (5237777325).

The spelling of 2021166123 in words is "two billion, twenty-one million, one hundred sixty-six thousand, one hundred twenty-three".