206121560340 has 24 divisors (see below), whose sum is σ = 577140369120. Its totient is φ = 54965749408.

The previous prime is 206121560317. The next prime is 206121560347. The reversal of 206121560340 is 43065121602.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 206121560298 and 206121560307.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206121560347) 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 7 ways as a sum of consecutive naturals, for example, 1717679610 + ... + 1717679729.

It is an arithmetic number, because the mean of its divisors is an integer number (24047515380).

Almost surely, 2^206121560340 is an apocalyptic number.

206121560340 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

206121560340 is an abundant number, since it is smaller than the sum of its proper divisors (371018808780).

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

206121560340 is a wasteful number, since it uses less digits than its factorization.

206121560340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3435359351 (or 3435359349 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

Adding to 206121560340 its reverse (43065121602), we get a palindrome (249186681942).

The spelling of 206121560340 in words is "two hundred six billion, one hundred twenty-one million, five hundred sixty thousand, three hundred forty".