201131002021 has 4 divisors (see below), whose sum is σ = 212962237452. Its totient is φ = 189299766592.

The previous prime is 201131002013. The next prime is 201131002027. The reversal of 201131002021 is 120200131102.

201131002021 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, and also an emirpimes, since its reverse is a distinct semiprime: 120200131102 = 2 ⋅60100065551.

It can be written as a sum of positive squares in 2 ways, for example, as 68426712225 + 132704289796 = 261585^2 + 364286^2 .

It is a cyclic number.

It is not a de Polignac number, because 201131002021 - 2³ = 201131002013 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 201131001992 and 201131002010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (201131002027) 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, 5915617690 + ... + 5915617723.

It is an arithmetic number, because the mean of its divisors is an integer number (53240559363).

Almost surely, 2^201131002021 is an apocalyptic number.

It is an amenable number.

201131002021 is a deficient number, since it is larger than the sum of its proper divisors (11831235431).

201131002021 is a wasteful number, since it uses less digits than its factorization.

201131002021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11831235430.

The product of its (nonzero) digits is 24, while the sum is 13.

Adding to 201131002021 its reverse (120200131102), we get a palindrome (321331133123).

The spelling of 201131002021 in words is "two hundred one billion, one hundred thirty-one million, two thousand, twenty-one".