2021342345405 has 4 divisors (see below), whose sum is σ = 2425610814492. Its totient is φ = 1617073876320.

The previous prime is 2021342345387. The next prime is 2021342345417. The reversal of 2021342345405 is 5045432431202.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 369443936761 + 1651898408644 = 607819^2 + 1285262^2 .

It is not a de Polignac number, because 2021342345405 - 2¹² = 2021342341309 is a prime.

It is a super-2 number, since 2×2021342345405² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 202134234536 + ... + 202134234545.

It is an arithmetic number, because the mean of its divisors is an integer number (606402703623).

Almost surely, 2^{2021342345405} is an apocalyptic number.

It is an amenable number.

2021342345405 is a deficient number, since it is larger than the sum of its proper divisors (404268469087).

2021342345405 is an equidigital number, since it uses as much as digits as its factorization.

2021342345405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 404268469086.

The product of its (nonzero) digits is 115200, while the sum is 35.

Adding to 2021342345405 its reverse (5045432431202), we get a palindrome (7066774776607).

The spelling of 2021342345405 in words is "two trillion, twenty-one billion, three hundred forty-two million, three hundred forty-five thousand, four hundred five".