206121150100 has 18 divisors (see below), whose sum is σ = 447282895934. Its totient is φ = 82448460000.

The previous prime is 206121150097. The next prime is 206121150107. The reversal of 206121150100 is 1051121602.

It can be written as a sum of positive squares in 3 ways, for example, as 44296779024 + 161824371076 = 210468^2 + 402274^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206121150107) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1030605651 + ... + 1030605850.

Almost surely, 2^206121150100 is an apocalyptic number.

206121150100 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206121150100 is an abundant number, since it is smaller than the sum of its proper divisors (241161745834).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

206121150100 is a wasteful number, since it uses less digits than its factorization.

206121150100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2061211515 (or 2061211508 counting only the distinct ones).

The product of its (nonzero) digits is 120, while the sum is 19.

Adding to 206121150100 its reverse (1051121602), we get a palindrome (207172271702).

The spelling of 206121150100 in words is "two hundred six billion, one hundred twenty-one million, one hundred fifty thousand, one hundred".