2021340340423 has 4 divisors (see below), whose sum is σ = 2030015621088. Its totient is φ = 2012665059760.

The previous prime is 2021340340307. The next prime is 2021340340427. The reversal of 2021340340423 is 3240430431202.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2021340340423 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2021340340391 and 2021340340400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021340340427) 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, 4337639983 + ... + 4337640448.

It is an arithmetic number, because the mean of its divisors is an integer number (507503905272).

Almost surely, 2^{2021340340423} is an apocalyptic number.

2021340340423 is a deficient number, since it is larger than the sum of its proper divisors (8675280665).

2021340340423 is an equidigital number, since it uses as much as digits as its factorization.

2021340340423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8675280664.

The product of its (nonzero) digits is 13824, while the sum is 28.

Adding to 2021340340423 its reverse (3240430431202), we get a palindrome (5261770771625).

The spelling of 2021340340423 in words is "two trillion, twenty-one billion, three hundred forty million, three hundred forty thousand, four hundred twenty-three".