2021110101 has 12 divisors (see below), whose sum is σ = 2919916428. Its totient is φ = 1347159744.

The previous prime is 2021110099. The next prime is 2021110103. The reversal of 2021110101 is 1010111202.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2021110099) and next prime (2021110103).

It can be written as a sum of positive squares in 2 ways, for example, as 819447876 + 1201662225 = 28626^2 + 34665^2 .

It is not a de Polignac number, because 2021110101 - 2¹ = 2021110099 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2021110103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40911 + ... + 75603.

It is an arithmetic number, because the mean of its divisors is an integer number (243326369).

Almost surely, 2^2021110101 is an apocalyptic number.

It is an amenable number.

2021110101 is a deficient number, since it is larger than the sum of its proper divisors (898806327).

2021110101 is a wasteful number, since it uses less digits than its factorization.

2021110101 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41172 (or 41169 counting only the distinct ones).

The product of its (nonzero) digits is 4, while the sum is 9.

The square root of 2021110101 is about 44956.7581237793. The cubic root of 2021110101 is about 1264.3383878521.

Adding to 2021110101 its reverse (1010111202), we get a palindrome (3031221303).

The spelling of 2021110101 in words is "two billion, twenty-one million, one hundred ten thousand, one hundred one".