206120600021 has 8 divisors (see below), whose sum is σ = 236309514240. Its totient is φ = 176117464368.

The previous prime is 206120599973. The next prime is 206120600029. The reversal of 206120600021 is 120006021602.

It is a happy number.

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 206120600021 - 2²⁶ = 206053491157 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 206120599966 and 206120600002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206120600029) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 46442261 + ... + 46446698.

It is an arithmetic number, because the mean of its divisors is an integer number (29538689280).

Almost surely, 2^206120600021 is an apocalyptic number.

It is an amenable number.

206120600021 is a deficient number, since it is larger than the sum of its proper divisors (30188914219).

206120600021 is an equidigital number, since it uses as much as digits as its factorization.

206120600021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 92889283.

The product of its (nonzero) digits is 288, while the sum is 20.

Adding to 206120600021 its reverse (120006021602), we get a palindrome (326126621623).

The spelling of 206120600021 in words is "two hundred six billion, one hundred twenty million, six hundred thousand, twenty-one".