2021343220123 has 4 divisors (see below), whose sum is σ = 2023696356280. Its totient is φ = 2018990083968.

The previous prime is 2021343220097. The next prime is 2021343220147. The reversal of 2021343220123 is 3210223431202.

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 2021343220123 - 2¹³ = 2021343211931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021343280123) 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, 1176566790 + ... + 1176568507.

It is an arithmetic number, because the mean of its divisors is an integer number (505924089070).

Almost surely, 2^{2021343220123} is an apocalyptic number.

2021343220123 is a deficient number, since it is larger than the sum of its proper divisors (2353136157).

2021343220123 is an equidigital number, since it uses as much as digits as its factorization.

2021343220123 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2353136156.

The product of its (nonzero) digits is 3456, while the sum is 25.

Adding to 2021343220123 its reverse (3210223431202), we get a palindrome (5231566651325).

The spelling of 2021343220123 in words is "two trillion, twenty-one billion, three hundred forty-three million, two hundred twenty thousand, one hundred twenty-three".