2021011291 has 16 divisors (see below), whose sum is σ = 2190097728. Its totient is φ = 1853913600.

The previous prime is 2021011271. The next prime is 2021011297. The reversal of 2021011291 is 1921101202.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 2021011291 - 2¹³ = 2021003099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2021011297) 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 15 ways as a sum of consecutive naturals, for example, 2655351 + ... + 2656111.

It is an arithmetic number, because the mean of its divisors is an integer number (136881108).

Almost surely, 2^2021011291 is an apocalyptic number.

2021011291 is a deficient number, since it is larger than the sum of its proper divisors (169086437).

2021011291 is a wasteful number, since it uses less digits than its factorization.

2021011291 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1782.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 2021011291 is about 44955.6591654488. The cubic root of 2021011291 is about 1264.3177834473.

Adding to 2021011291 its reverse (1921101202), we get a palindrome (3942112493).

The spelling of 2021011291 in words is "two billion, twenty-one million, eleven thousand, two hundred ninety-one".