206600008921 has 4 divisors (see below), whose sum is σ = 206668445200. Its totient is φ = 206531572644.

The previous prime is 206600008859. The next prime is 206600008961. The reversal of 206600008921 is 129800006602.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 206600008921 - 2¹³ = 206600000729 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (206600008961) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34213611 + ... + 34219648.

It is an arithmetic number, because the mean of its divisors is an integer number (51667111300).

Almost surely, 2^206600008921 is an apocalyptic number.

It is an amenable number.

206600008921 is a deficient number, since it is larger than the sum of its proper divisors (68436279).

206600008921 is an equidigital number, since it uses as much as digits as its factorization.

206600008921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68436278.

The product of its (nonzero) digits is 10368, while the sum is 34.

The spelling of 206600008921 in words is "two hundred six billion, six hundred million, eight thousand, nine hundred twenty-one".