206121807 has 16 divisors (see below), whose sum is σ = 305885280. Its totient is φ = 137180736.

The previous prime is 206121793. The next prime is 206121809. The reversal of 206121807 is 708121602.

206121807 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 206121807 - 2⁷ = 206121679 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206121809) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10473 + ... + 22845.

It is an arithmetic number, because the mean of its divisors is an integer number (19117830).

Almost surely, 2^206121807 is an apocalyptic number.

206121807 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

206121807 is a deficient number, since it is larger than the sum of its proper divisors (99763473).

206121807 is a wasteful number, since it uses less digits than its factorization.

206121807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12999 (or 12993 counting only the distinct ones).

The product of its (nonzero) digits is 1344, while the sum is 27.

The square root of 206121807 is about 14356.9428152375. The cubic root of 206121807 is about 590.7104407510.

The spelling of 206121807 in words is "two hundred six million, one hundred twenty-one thousand, eight hundred seven".