201030440021 has 4 divisors (see below), whose sum is σ = 203289209100. Its totient is φ = 198771670944.

The previous prime is 201030440003. The next prime is 201030440033. The reversal of 201030440021 is 120044030102.

201030440021 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 103741968100 + 97288471921 = 322090^2 + 311911^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-201030440021 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201030442021) 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, 1129384406 + ... + 1129384583.

It is an arithmetic number, because the mean of its divisors is an integer number (50822302275).

Almost surely, 2^201030440021 is an apocalyptic number.

It is an amenable number.

201030440021 is a deficient number, since it is larger than the sum of its proper divisors (2258769079).

201030440021 is an equidigital number, since it uses as much as digits as its factorization.

201030440021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2258769078.

The product of its (nonzero) digits is 192, while the sum is 17.

Adding to 201030440021 its reverse (120044030102), we get a palindrome (321074470123).

The spelling of 201030440021 in words is "two hundred one billion, thirty million, four hundred forty thousand, twenty-one".