2021020011 has 16 divisors (see below), whose sum is σ = 3067132320. Its totient is φ = 1314483840.

The previous prime is 2021020007. The next prime is 2021020021. The reversal of 2021020011 is 1100201202.

It is not a de Polignac number, because 2021020011 - 2² = 2021020007 is a prime.

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

It is a junction number, because it is equal to n+sod(n) for n = 2021019975 and 2021020002.

It is not an unprimeable number, because it can be changed into a prime (2021020021) 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 15 ways as a sum of consecutive naturals, for example, 911730 + ... + 913943.

It is an arithmetic number, because the mean of its divisors is an integer number (191695770).

Almost surely, 2^2021020011 is an apocalyptic number.

2021020011 is a deficient number, since it is larger than the sum of its proper divisors (1046112309).

2021020011 is a wasteful number, since it uses less digits than its factorization.

2021020011 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1825723 (or 1825717 counting only the distinct ones).

The product of its (nonzero) digits is 8, while the sum is 9.

The square root of 2021020011 is about 44955.7561497969. The cubic root of 2021020011 is about 1264.3196018167.

Adding to 2021020011 its reverse (1100201202), we get a palindrome (3121221213).

The spelling of 2021020011 in words is "two billion, twenty-one million, twenty thousand, eleven".