206420500105221 has 8 divisors (see below), whose sum is σ = 275227435748160. Its totient is φ = 137613615599552.

The previous prime is 206420500105213. The next prime is 206420500105231. The reversal of 206420500105221 is 122501005024602.

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 206420500105221 - 2³ = 206420500105213 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206420500105201) 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, 2086836 + ... + 20425373.

It is an arithmetic number, because the mean of its divisors is an integer number (34403429468520).

Almost surely, 2^{206420500105221} is an apocalyptic number.

It is an amenable number.

206420500105221 is a deficient number, since it is larger than the sum of its proper divisors (68806935642939).

206420500105221 is a wasteful number, since it uses less digits than its factorization.

206420500105221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25568635.

The product of its (nonzero) digits is 9600, while the sum is 30.

Adding to 206420500105221 its reverse (122501005024602), we get a palindrome (328921505129823).

The spelling of 206420500105221 in words is "two hundred six trillion, four hundred twenty billion, five hundred million, one hundred five thousand, two hundred twenty-one".