2021312122123 has 4 divisors (see below), whose sum is σ = 2310070996720. Its totient is φ = 1732553247528.

The previous prime is 2021312122121. The next prime is 2021312122147. The reversal of 2021312122123 is 3212212131202.

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 2021312122123 - 2¹ = 2021312122121 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021312122094 and 2021312122103.

It is not an unprimeable number, because it can be changed into a prime (2021312122121) 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, 144379437288 + ... + 144379437301.

It is an arithmetic number, because the mean of its divisors is an integer number (577517749180).

Almost surely, 2^{2021312122123} is an apocalyptic number.

2021312122123 is a deficient number, since it is larger than the sum of its proper divisors (288758874597).

2021312122123 is an equidigital number, since it uses as much as digits as its factorization.

2021312122123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288758874596.

The product of its (nonzero) digits is 576, while the sum is 22.

Adding to 2021312122123 its reverse (3212212131202), we get a palindrome (5233524253325).

The spelling of 2021312122123 in words is "two trillion, twenty-one billion, three hundred twelve million, one hundred twenty-two thousand, one hundred twenty-three".