206623412321 has 4 divisors (see below), whose sum is σ = 206624634672. Its totient is φ = 206622189972.

The previous prime is 206623412311. The next prime is 206623412327. The reversal of 206623412321 is 123214326602.

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-206623412321 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206623412327) 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, 307235 + ... + 712488.

It is an arithmetic number, because the mean of its divisors is an integer number (51656158668).

Almost surely, 2^206623412321 is an apocalyptic number.

It is an amenable number.

206623412321 is a deficient number, since it is larger than the sum of its proper divisors (1222351).

206623412321 is a wasteful number, since it uses less digits than its factorization.

206623412321 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1222350.

The product of its (nonzero) digits is 20736, while the sum is 32.

Adding to 206623412321 its reverse (123214326602), we get a palindrome (329837738923).

The spelling of 206623412321 in words is "two hundred six billion, six hundred twenty-three million, four hundred twelve thousand, three hundred twenty-one".