340566221321 has 4 divisors (see below), whose sum is σ = 341277216000. Its totient is φ = 339855226644.

The previous prime is 340566221311. The next prime is 340566221417. The reversal of 340566221321 is 123122665043.

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.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-340566221321 is a prime.

It is a super-2 number, since 2×340566221321² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (340566221311) 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, 355496621 + ... + 355497578.

It is an arithmetic number, because the mean of its divisors is an integer number (85319304000).

Almost surely, 2^340566221321 is an apocalyptic number.

It is an amenable number.

340566221321 is a deficient number, since it is larger than the sum of its proper divisors (710994679).

340566221321 is an equidigital number, since it uses as much as digits as its factorization.

340566221321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710994678.

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 340566221321 its reverse (123122665043), we get a palindrome (463688886364).

The spelling of 340566221321 in words is "three hundred forty billion, five hundred sixty-six million, two hundred twenty-one thousand, three hundred twenty-one".