206121212132 has 18 divisors (see below), whose sum is σ = 396485225094. Its totient is φ = 93691459840.

The previous prime is 206121212047. The next prime is 206121212149. The reversal of 206121212132 is 231212121602.

It can be written as a sum of positive squares in only one way, i.e., 148954314916 + 57166897216 = 385946^2 + 239096^2 .

It is a junction number, because it is equal to n+sod(n) for n = 206121212098 and 206121212107.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 212934653 + ... + 212935620.

Almost surely, 2^206121212132 is an apocalyptic number.

206121212132 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

It is an amenable number.

206121212132 is a deficient number, since it is larger than the sum of its proper divisors (190364012962).

206121212132 is a wasteful number, since it uses less digits than its factorization.

206121212132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425870299 (or 425870286 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 23.

Adding to 206121212132 its reverse (231212121602), we get a palindrome (437333333734).

The spelling of 206121212132 in words is "two hundred six billion, one hundred twenty-one million, two hundred twelve thousand, one hundred thirty-two".