344668537340821 has 4 divisors (see below), whose sum is σ = 344668576600512. Its totient is φ = 344668498081132.

The previous prime is 344668537340807. The next prime is 344668537340839. The reversal of 344668537340821 is 128043735866443.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 344668537340821 - 2⁷ = 344668537340693 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (344668537340861) 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, 249876 + ... + 26256418.

It is an arithmetic number, because the mean of its divisors is an integer number (86167144150128).

Almost surely, 2^{344668537340821} is an apocalyptic number.

It is an amenable number.

344668537340821 is a deficient number, since it is larger than the sum of its proper divisors (39259691).

344668537340821 is a wasteful number, since it uses less digits than its factorization.

344668537340821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39259690.

The product of its (nonzero) digits is 278691840, while the sum is 64.

The spelling of 344668537340821 in words is "three hundred forty-four trillion, six hundred sixty-eight billion, five hundred thirty-seven million, three hundred forty thousand, eight hundred twenty-one".