340021021243423 has 4 divisors (see below), whose sum is σ = 366176484416008. Its totient is φ = 313865558070840.

The previous prime is 340021021243279. The next prime is 340021021243429. The reversal of 340021021243423 is 324342120120043.

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 340021021243423 - 2³³ = 340012431308831 is a prime.

It is a super-2 number, since 2×340021021243423² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (340021021243429) 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, 13077731586273 + ... + 13077731586298.

It is an arithmetic number, because the mean of its divisors is an integer number (91544121104002).

Almost surely, 2^{340021021243423} is an apocalyptic number.

340021021243423 is a deficient number, since it is larger than the sum of its proper divisors (26155463172585).

340021021243423 is a wasteful number, since it uses less digits than its factorization.

340021021243423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26155463172584.

The product of its (nonzero) digits is 27648, while the sum is 31.

Adding to 340021021243423 its reverse (324342120120043), we get a palindrome (664363141363466).

The spelling of 340021021243423 in words is "three hundred forty trillion, twenty-one billion, twenty-one million, two hundred forty-three thousand, four hundred twenty-three".