2021021011 has 4 divisors (see below), whose sum is σ = 2028162712. Its totient is φ = 2013879312.

The previous prime is 2021020973. The next prime is 2021021021. The reversal of 2021021011 is 1101201202.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2021021011 - 2²³ = 2012632403 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021021021) 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 3 ways as a sum of consecutive naturals, for example, 3570426 + ... + 3570991.

It is an arithmetic number, because the mean of its divisors is an integer number (507040678).

Almost surely, 2^2021021011 is an apocalyptic number.

2021021011 is a deficient number, since it is larger than the sum of its proper divisors (7141701).

2021021011 is an equidigital number, since it uses as much as digits as its factorization.

2021021011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7141700.

The product of its (nonzero) digits is 8, while the sum is 10.

The square root of 2021021011 is about 44955.7672718418. The cubic root of 2021021011 is about 1264.3198103449.

Adding to 2021021011 its reverse (1101201202), we get a palindrome (3122222213).

The spelling of 2021021011 in words is "two billion, twenty-one million, twenty-one thousand, eleven".