201120021 has 6 divisors (see below), whose sum is σ = 290506710. Its totient is φ = 134080008.

The previous prime is 201119969. The next prime is 201120041. The reversal of 201120021 is 120021102.

It can be written as a sum of positive squares in only one way, i.e., 163481796 + 37638225 = 12786^2 + 6135^2 .

It is not a de Polignac number, because 201120021 - 2¹⁰ = 201118997 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: 22346669 = 201120021 / (2 + 0 + 1 + 1 + 2 + 0 + 0 + 2 + 1).

It is a junction number, because it is equal to n+sod(n) for n = 201119985 and 201120012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201120041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11173326 + ... + 11173343.

It is an arithmetic number, because the mean of its divisors is an integer number (48417785).

Almost surely, 2^201120021 is an apocalyptic number.

It is an amenable number.

201120021 is a deficient number, since it is larger than the sum of its proper divisors (89386689).

201120021 is a wasteful number, since it uses less digits than its factorization.

201120021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22346675 (or 22346672 counting only the distinct ones).

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

The square root of 201120021 is about 14181.6790613806. The cubic root of 201120021 is about 585.8931699241.

Adding to 201120021 its reverse (120021102), we get a palindrome (321141123).

The spelling of 201120021 in words is "two hundred one million, one hundred twenty thousand, twenty-one".