2011101021 has 16 divisors (see below), whose sum is σ = 2980105920. Its totient is φ = 1340420400.

The previous prime is 2011100989. The next prime is 2011101031. The reversal of 2011101021 is 1201011102.

It is a happy number.

It is not a de Polignac number, because 2011101021 - 2⁵ = 2011100989 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 = 2011100994 and 2011101012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011101031) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 198171 + ... + 208071.

It is an arithmetic number, because the mean of its divisors is an integer number (186256620).

Almost surely, 2^2011101021 is an apocalyptic number.

It is an amenable number.

2011101021 is a deficient number, since it is larger than the sum of its proper divisors (969004899).

2011101021 is an equidigital number, since it uses as much as digits as its factorization.

2011101021 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17433 (or 17427 counting only the distinct ones).

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

The square root of 2011101021 is about 44845.3009912967. The cubic root of 2011101021 is about 1262.2478186109.

Adding to 2011101021 its reverse (1201011102), we get a palindrome (3212112123).

The spelling of 2011101021 in words is "two billion, eleven million, one hundred one thousand, twenty-one".