2021111011 has 16 divisors (see below), whose sum is σ = 2165889024. Its totient is φ = 1879300224.

The previous prime is 2021110981. The next prime is 2021111041. The reversal of 2021111011 is 1101111202.

It is an interprime number because it is at equal distance from previous prime (2021110981) and next prime (2021111041).

It is not a de Polignac number, because 2021111011 - 2²¹ = 2019013859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2021111041) 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, 914670 + ... + 916876.

It is an arithmetic number, because the mean of its divisors is an integer number (135368064).

Almost surely, 2^2021111011 is an apocalyptic number.

2021111011 is a deficient number, since it is larger than the sum of its proper divisors (144778013).

2021111011 is a wasteful number, since it uses less digits than its factorization.

2021111011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2850.

The product of its (nonzero) digits is 4, while the sum is 10.

The square root of 2021111011 is about 44956.7682446147. The cubic root of 2021111011 is about 1264.3385776072.

Adding to 2021111011 its reverse (1101111202), we get a palindrome (3122222213).

The spelling of 2021111011 in words is "two billion, twenty-one million, one hundred eleven thousand, eleven".