2011213021 has 4 divisors (see below), whose sum is σ = 2027049472. Its totient is φ = 1995376572.

The previous prime is 2011213007. The next prime is 2011213037. The reversal of 2011213021 is 1203121102.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 2011213021 - 2¹⁹ = 2010688733 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2011212992 and 2011213010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2011213091) 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 3 ways as a sum of consecutive naturals, for example, 7918035 + ... + 7918288.

It is an arithmetic number, because the mean of its divisors is an integer number (506762368).

Almost surely, 2^2011213021 is an apocalyptic number.

It is an amenable number.

2011213021 is a deficient number, since it is larger than the sum of its proper divisors (15836451).

2011213021 is a wasteful number, since it uses less digits than its factorization.

2011213021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15836450.

The product of its (nonzero) digits is 24, while the sum is 13.

The square root of 2011213021 is about 44846.5497112097. The cubic root of 2011213021 is about 1262.2712500762.

Adding to 2011213021 its reverse (1203121102), we get a palindrome (3214334123).

It can be divided in two parts, 20112 and 13021, that added together give a palindrome (33133).

The spelling of 2011213021 in words is "two billion, eleven million, two hundred thirteen thousand, twenty-one".