2021143123 has 4 divisors (see below), whose sum is σ = 2021237680. Its totient is φ = 2021048568.

The previous prime is 2021143099. The next prime is 2021143127. The reversal of 2021143123 is 3213411202.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021143123 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2021143123.

It is not an unprimeable number, because it can be changed into a prime (2021143127) 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, 1693 + ... + 63601.

It is an arithmetic number, because the mean of its divisors is an integer number (505309420).

Almost surely, 2^2021143123 is an apocalyptic number.

2021143123 is a deficient number, since it is larger than the sum of its proper divisors (94557).

2021143123 is an equidigital number, since it uses as much as digits as its factorization.

2021143123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94556.

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 2021143123 is about 44957.1253863056. The cubic root of 2021143123 is about 1264.3452736315.

Adding to 2021143123 its reverse (3213411202), we get a palindrome (5234554325).

The spelling of 2021143123 in words is "two billion, twenty-one million, one hundred forty-three thousand, one hundred twenty-three".