200120021993 has 4 divisors (see below), whose sum is σ = 200204928900. Its totient is φ = 200035115088.

The previous prime is 200120021939. The next prime is 200120021999. The reversal of 200120021993 is 399120021002.

200120021993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 71474418409 + 128645603584 = 267347^2 + 358672^2 .

It is a cyclic number.

It is not a de Polignac number, because 200120021993 - 2¹² = 200120017897 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (200120021999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42449918 + ... + 42454631.

It is an arithmetic number, because the mean of its divisors is an integer number (50051232225).

Almost surely, 2^200120021993 is an apocalyptic number.

It is an amenable number.

200120021993 is a deficient number, since it is larger than the sum of its proper divisors (84906907).

200120021993 is an equidigital number, since it uses as much as digits as its factorization.

200120021993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84906906.

The product of its (nonzero) digits is 1944, while the sum is 29.

Adding to 200120021993 its reverse (399120021002), we get a palindrome (599240042995).

The spelling of 200120021993 in words is "two hundred billion, one hundred twenty million, twenty-one thousand, nine hundred ninety-three".