206144223621 has 8 divisors (see below), whose sum is σ = 314124531264. Its totient is φ = 117796699200.

The previous prime is 206144223577. The next prime is 206144223629. The reversal of 206144223621 is 126322441602.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 206144223621 - 2¹¹ = 206144221573 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (206144223629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4908195780 + ... + 4908195821.

It is an arithmetic number, because the mean of its divisors is an integer number (39265566408).

Almost surely, 2^206144223621 is an apocalyptic number.

206144223621 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

206144223621 is a deficient number, since it is larger than the sum of its proper divisors (107980307643).

206144223621 is an equidigital number, since it uses as much as digits as its factorization.

206144223621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9816391611.

The product of its (nonzero) digits is 27648, while the sum is 33.

The spelling of 206144223621 in words is "two hundred six billion, one hundred forty-four million, two hundred twenty-three thousand, six hundred twenty-one".