206155332021101 has 4 divisors (see below), whose sum is σ = 206939192599392. Its totient is φ = 205371471442812.

The previous prime is 206155332021019. The next prime is 206155332021157. The reversal of 206155332021101 is 101120233551602.

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-206155332021101 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206155332021181) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 391930288751 + ... + 391930289276.

It is an arithmetic number, because the mean of its divisors is an integer number (51734798149848).

Almost surely, 2^{206155332021101} is an apocalyptic number.

It is an amenable number.

206155332021101 is a deficient number, since it is larger than the sum of its proper divisors (783860578291).

206155332021101 is an equidigital number, since it uses as much as digits as its factorization.

206155332021101 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 783860578290.

The product of its (nonzero) digits is 10800, while the sum is 32.

Adding to 206155332021101 its reverse (101120233551602), we get a palindrome (307275565572703).

The spelling of 206155332021101 in words is "two hundred six trillion, one hundred fifty-five billion, three hundred thirty-two million, twenty-one thousand, one hundred one".