2021312123 has 8 divisors (see below), whose sum is σ = 2036074656. Its totient is φ = 2006568000.

The previous prime is 2021312107. The next prime is 2021312149. The reversal of 2021312123 is 3212131202.

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

It is a cyclic number.

It is not a de Polignac number, because 2021312123 - 2⁴ = 2021312107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021312173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 277415 + ... + 284607.

It is an arithmetic number, because the mean of its divisors is an integer number (254509332).

Almost surely, 2^2021312123 is an apocalyptic number.

2021312123 is a deficient number, since it is larger than the sum of its proper divisors (14762533).

2021312123 is a wasteful number, since it uses less digits than its factorization.

2021312123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9205.

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 2021312123 is about 44959.0049155895. The cubic root of 2021312123 is about 1264.3805125009.

Adding to 2021312123 its reverse (3212131202), we get a palindrome (5233443325).

The spelling of 2021312123 in words is "two billion, twenty-one million, three hundred twelve thousand, one hundred twenty-three".