206123806165421 has 8 divisors (see below), whose sum is σ = 206419683153024. Its totient is φ = 205827986124000.

The previous prime is 206123806165399. The next prime is 206123806165441. The reversal of 206123806165421 is 124561608321602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 206123806165421 - 2⁶ = 206123806165357 is a prime.

It is a super-2 number, since 2×206123806165421² (a number of 29 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 (206123806165441) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6989456 + ... + 21473241.

It is an arithmetic number, because the mean of its divisors is an integer number (25802460394128).

Almost surely, 2^{206123806165421} is an apocalyptic number.

It is an amenable number.

206123806165421 is a deficient number, since it is larger than the sum of its proper divisors (295876987603).

206123806165421 is an equidigital number, since it uses as much as digits as its factorization.

206123806165421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28473091.

The product of its (nonzero) digits is 829440, while the sum is 47.

The spelling of 206123806165421 in words is "two hundred six trillion, one hundred twenty-three billion, eight hundred six million, one hundred sixty-five thousand, four hundred twenty-one".