206121143445 has 32 divisors (see below), whose sum is σ = 377060487168. Its totient is φ = 94188495168.

The previous prime is 206121143443. The next prime is 206121143513. The reversal of 206121143445 is 544341121602.

It is a happy number.

It is not a de Polignac number, because 206121143445 - 2¹ = 206121143443 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206121143441) 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 31 ways as a sum of consecutive naturals, for example, 138829 + ... + 656898.

It is an arithmetic number, because the mean of its divisors is an integer number (11783140224).

Almost surely, 2^206121143445 is an apocalyptic number.

It is an amenable number.

206121143445 is a deficient number, since it is larger than the sum of its proper divisors (170939343723).

206121143445 is a wasteful number, since it uses less digits than its factorization.

206121143445 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 798209.

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 206121143445 in words is "two hundred six billion, one hundred twenty-one million, one hundred forty-three thousand, four hundred forty-five".