2021131021 has 16 divisors (see below), whose sum is σ = 2545400704. Its totient is φ = 1561944384.

The previous prime is 2021131019. The next prime is 2021131033. The reversal of 2021131021 is 1201311202.

It is not a de Polignac number, because 2021131021 - 2¹ = 2021131019 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a junction number, because it is equal to n+sod(n) for n = 2021130992 and 2021131010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021131001) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254346 + ... + 262171.

It is an arithmetic number, because the mean of its divisors is an integer number (159087544).

Almost surely, 2^2021131021 is an apocalyptic number.

It is an amenable number.

2021131021 is a deficient number, since it is larger than the sum of its proper divisors (524269683).

2021131021 is a wasteful number, since it uses less digits than its factorization.

2021131021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 516580.

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

The square root of 2021131021 is about 44956.9907911995. The cubic root of 2021131021 is about 1264.3427501194.

Adding to 2021131021 its reverse (1201311202), we get a palindrome (3222442223).

The spelling of 2021131021 in words is "two billion, twenty-one million, one hundred thirty-one thousand, twenty-one".