200120021001 has 12 divisors (see below), whose sum is σ = 289235676912. Its totient is φ = 133333305336.

The previous prime is 200120020987. The next prime is 200120021027. The reversal of 200120021001 is 100120021002.

It is not a de Polignac number, because 200120021001 - 2⁶ = 200120020937 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is not an unprimeable number, because it can be changed into a prime (200120021401) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6654331 + ... + 6684336.

It is an arithmetic number, because the mean of its divisors is an integer number (24102973076).

Almost surely, 2^200120021001 is an apocalyptic number.

It is an amenable number.

200120021001 is a deficient number, since it is larger than the sum of its proper divisors (89115655911).

200120021001 is a wasteful number, since it uses less digits than its factorization.

200120021001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13340340 (or 13340337 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

Adding to 200120021001 its reverse (100120021002), we get a palindrome (300240042003).

Subtracting from 200120021001 its reverse (100120021002), we obtain a palindrome (99999999999).

The spelling of 200120021001 in words is "two hundred billion, one hundred twenty million, twenty-one thousand, one".