2011020021 has 32 divisors (see below), whose sum is σ = 3150336000. Its totient is φ = 1264350384.

The previous prime is 2011020017. The next prime is 2011020023. The reversal of 2011020021 is 1200201102.

It is not a de Polignac number, because 2011020021 - 2² = 2011020017 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 = 2011019985 and 2011020012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011020023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 105610 + ... + 123188.

It is an arithmetic number, because the mean of its divisors is an integer number (98448000).

Almost surely, 2^2011020021 is an apocalyptic number.

It is an amenable number.

2011020021 is a deficient number, since it is larger than the sum of its proper divisors (1139315979).

2011020021 is a wasteful number, since it uses less digits than its factorization.

2011020021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17830 (or 17824 counting only the distinct ones).

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

The square root of 2011020021 is about 44844.3978775499. The cubic root of 2011020021 is about 1262.2308720983.

Adding to 2011020021 its reverse (1200201102), we get a palindrome (3211221123).

The spelling of 2011020021 in words is "two billion, eleven million, twenty thousand, twenty-one".