20121000201 has 6 divisors (see below), whose sum is σ = 29063666970. Its totient is φ = 13414000128.

The previous prime is 20121000161. The next prime is 20121000257. The reversal of 20121000201 is 10200012102.

It can be written as a sum of positive squares in only one way, i.e., 14423769801 + 5697230400 = 120099^2 + 75480^2 .

It is not a de Polignac number, because 20121000201 - 2⁷ = 20121000073 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9), and also a Moran number because the ratio is a prime number: 2235666689 = 20121000201 / (2 + 0 + 1 + 2 + 1 + 0 + 0 + 0 + 2 + 0 + 1).

It is not an unprimeable number, because it can be changed into a prime (20121000281) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1117833336 + ... + 1117833353.

It is an arithmetic number, because the mean of its divisors is an integer number (4843944495).

Almost surely, 2^20121000201 is an apocalyptic number.

It is an amenable number.

20121000201 is a deficient number, since it is larger than the sum of its proper divisors (8942666769).

20121000201 is a wasteful number, since it uses less digits than its factorization.

20121000201 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2235666695 (or 2235666692 counting only the distinct ones).

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

Adding to 20121000201 its reverse (10200012102), we get a palindrome (30321012303).

The spelling of 20121000201 in words is "twenty billion, one hundred twenty-one million, two hundred one", and thus it is an aban number.